{"id":"RUSTSEC-2021-0055","revision":null,"records":[{"revision":"719d4836fa844876b8ab375d673a6057","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-3449","aliases":[],"title":"NULL pointer deref in signature_algorithms processing","description":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).","state":0,"publishedAt":"2021-03-25T14:25:13.659+00:00","modifiedAt":"2026-10-08T21:13:50.095+00:00","affected":[{"ecosystem":"Vendor product","name":"OpenSSL","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"OpenSSL\",\n                    \"product\": \"OpenSSL\",\n                    \"versions\": [\n                        {\n                            \"version\": \"Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j)\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://www.openssl.org/news/secadv/20210325.txt","https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=fb9fa6b51defd48157eeb207f52181f735d96148","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd","https://www.debian.org/security/2021/dsa-4875","http://www.openwall.com/lists/oss-security/2021/03/27/1","http://www.openwall.com/lists/oss-security/2021/03/27/2","http://www.openwall.com/lists/oss-security/2021/03/28/3","http://www.openwall.com/lists/oss-security/2021/03/28/4","https://security.gentoo.org/glsa/202103-03","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/","https://www.oracle.com/security-alerts/cpuApr2021.html","https://www.tenable.com/security/tns-2021-10","https://www.tenable.com/security/tns-2021-09","https://security.netapp.com/advisory/ntap-20210513-0002/","https://security.netapp.com/advisory/ntap-20210326-0006/","https://security.freebsd.org/advisories/FreeBSD-SA-21:07.openssl.asc","https://www.tenable.com/security/tns-2021-06","https://www.tenable.com/security/tns-2021-05","https://kc.mcafee.com/corporate/index?page=content&id=SB10356","https://www.oracle.com//security-alerts/cpujul2021.html","https://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf","https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845","https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013","https://lists.debian.org/debian-lts-announce/2021/08/msg00029.html","https://www.oracle.com/security-alerts/cpuoct2021.html","https://www.oracle.com/security-alerts/cpuapr2022.html","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://www.oracle.com/security-alerts/cpujul2022.html","https://security.netapp.com/advisory/ntap-20240621-0006/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-3449","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-3449","identifiers":["CVE-2021-3449"]},"retained":false,"historicalAffected":[]},{"revision":"c31367fbe3fe44da9178bb4bbbe79e72","observedAt":"2026-11-09T22:13:28.122+00:00","statement":{"source":"euvd","id":"EUVD-2021-1628","aliases":["CVE-2021-3449","GHSA-83mx-573x-5rw9"],"title":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello)…","description":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[],"references":["https://www.openssl.org/news/secadv/20210325.txt","https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=fb9fa6b51defd48157eeb207f52181f735d96148","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd","https://www.debian.org/security/2021/dsa-4875","http://www.openwall.com/lists/oss-security/2021/03/27/1","http://www.openwall.com/lists/oss-security/2021/03/27/2","http://www.openwall.com/lists/oss-security/2021/03/28/3","http://www.openwall.com/lists/oss-security/2021/03/28/4","https://security.gentoo.org/glsa/202103-03","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/","https://www.oracle.com/security-alerts/cpuApr2021.html","https://www.tenable.com/security/tns-2021-10","https://www.tenable.com/security/tns-2021-09","https://security.netapp.com/advisory/ntap-20210513-0002/","https://security.netapp.com/advisory/ntap-20210326-0006/","https://security.freebsd.org/advisories/FreeBSD-SA-21:07.openssl.asc","https://www.tenable.com/security/tns-2021-06","https://www.tenable.com/security/tns-2021-05","https://kc.mcafee.com/corporate/index?page=content&id=SB10356","https://www.oracle.com//security-alerts/cpujul2021.html","https://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf","https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845","https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013","https://lists.debian.org/debian-lts-announce/2021/08/msg00029.html","https://www.oracle.com/security-alerts/cpuoct2021.html","https://www.oracle.com/security-alerts/cpuapr2022.html","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://www.oracle.com/security-alerts/cpujul2022.html","https://security.netapp.com/advisory/ntap-20240621-0006/"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-1628","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Mar 25, 2021, 2:25:13 PM","dateUpdated":"Oct 8, 2026, 9:13:50 PM"},"relatedAdvisories":[{"id":"openSUSE-SU-2021:2327-1","title":"Security update for nodejs12","vulnerabilityIds":["CVE-2020-7774","CVE-2021-22918","CVE-2021-23362","CVE-2021-27290","CVE-2021-3449","CVE-2021-3450"]},{"id":"openSUSE-SU-2024:11041-1","title":"matrix-synapse-1.43.0-1.1 on GA media","vulnerabilityIds":["CVE-2018-12291","CVE-2019-5885","CVE-2020-10108","CVE-2020-10109","CVE-2020-1971","CVE-2020-26257","CVE-2020-26891","CVE-2021-29471","CVE-2021-3449","CVE-2021-39163","CVE-2021-39164"]},{"id":"ICSA-22-069-09","title":"Siemens SINEC INS","vulnerabilityIds":["CVE-2019-19242","CVE-2019-19244","CVE-2019-19317","CVE-2019-19603","CVE-2019-19645","CVE-2019-19646","CVE-2019-19880","CVE-2019-19923","CVE-2019-19924","CVE-2019-19925","CVE-2019-19926","CVE-2020-1971","CVE-2020-7774","CVE-2020-8169","CVE-2020-8177","CVE-2020-8231","CVE-2020-8265","CVE-2020-8284","CVE-2020-8285","CVE-2020-8286","CVE-2020-8287","CVE-2020-8625","CVE-2020-9327","CVE-2020-11655","CVE-2020-11656","CVE-2020-13630","CVE-2020-13631","CVE-2020-13632","CVE-2020-13871","CVE-2020-15358","CVE-2020-27304","CVE-2021-3449","CVE-2021-3450","CVE-2021-3672","CVE-2021-3711","CVE-2021-3712","CVE-2021-22876","CVE-2021-22883","CVE-2021-22884","CVE-2021-22890","CVE-2021-22897","CVE-2021-22898","CVE-2021-22901","CVE-2021-22918","CVE-2021-22921","CVE-2021-22922","CVE-2021-22923","CVE-2021-22924","CVE-2021-22925","CVE-2021-22926","CVE-2021-22930","CVE-2021-22931","CVE-2021-22939","CVE-2021-22940","CVE-2021-22945","CVE-2021-22946","CVE-2021-22947","CVE-2021-23362","CVE-2021-23840","CVE-2021-25214","CVE-2021-25215","CVE-2021-25216","CVE-2021-25219","CVE-2021-27290","CVE-2021-32803","CVE-2021-32804","CVE-2021-37701","CVE-2021-37712","CVE-2021-37713","CVE-2021-39134","CVE-2021-39135"]},{"id":"RHSA-2021:1024","title":"Red 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Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2021-1628","identifiers":["EUVD-2021-1628","CVE-2021-3449","GHSA-83mx-573x-5rw9"]},"retained":false,"historicalAffected":[]},{"revision":"03d3960c799744bab5571a06136a35c3","observedAt":"2026-10-24T18:17:33.371+00:00","statement":{"source":"nvd","id":"CVE-2021-3449","aliases":[],"title":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello)…","description":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).","state":0,"publishedAt":"2021-03-25T15:15:13.45+00:00","modifiedAt":"2026-10-08T22:17:11.243+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9,"severity":"MEDIUM"},{"system":"CVSS 2.0 · nvd@nist.gov · Primary","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","score":4.3,"severity":"MEDIUM"}],"references":["http://www.openwall.com/lists/oss-security/2021/03/27/1","http://www.openwall.com/lists/oss-security/2021/03/27/2","http://www.openwall.com/lists/oss-security/2021/03/28/3","http://www.openwall.com/lists/oss-security/2021/03/28/4","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf","https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=fb9fa6b51defd48157eeb207f52181f735d96148","https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845","https://kc.mcafee.com/corporate/index?page=content&id=SB10356","https://lists.debian.org/debian-lts-announce/2021/08/msg00029.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/","https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013","https://security.freebsd.org/advisories/FreeBSD-SA-21:07.openssl.asc","https://security.gentoo.org/glsa/202103-03","https://security.netapp.com/advisory/ntap-20210326-0006/","https://security.netapp.com/advisory/ntap-20210513-0002/","https://security.netapp.com/advisory/ntap-20240621-0006/","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd","https://www.debian.org/security/2021/dsa-4875","https://www.openssl.org/news/secadv/20210325.txt","https://www.oracle.com//security-alerts/cpujul2021.html","https://www.oracle.com/security-alerts/cpuApr2021.html","https://www.oracle.com/security-alerts/cpuapr2022.html","https://www.oracle.com/security-alerts/cpujul2022.html","https://www.oracle.com/security-alerts/cpuoct2021.html","https://www.tenable.com/security/tns-2021-05","https://www.tenable.com/security/tns-2021-06","https://www.tenable.com/security/tns-2021-09","https://www.tenable.com/security/tns-2021-10"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3449","license":"NIST 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analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2021-3449","identifiers":["CVE-2021-3449"]},"retained":false,"historicalAffected":[]},{"revision":"1ab7e423a8d14a5792ef712bbdb8e9eb","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-83mx-573x-5rw9","aliases":["BIT-node-2021-3449","BIT-node-min-2021-3449","CVE-2021-3449","RUSTSEC-2021-0055"],"title":"openssl-src NULL pointer Dereference in signature_algorithms processing","description":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).","state":0,"publishedAt":"2021-08-25T20:54:02+00:00","modifiedAt":"2024-12-16T15:27:00.55712+00:00","affected":[{"ecosystem":"crates.io","name":"openssl-src","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"111.15.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2021-3449","https://www.tenable.com/security/tns-2021-10","https://www.tenable.com/security/tns-2021-09","https://www.tenable.com/security/tns-2021-06","https://www.tenable.com/security/tns-2021-05","https://www.oracle.com/security-alerts/cpuoct2021.html","https://www.oracle.com/security-alerts/cpujul2022.html","https://www.oracle.com/security-alerts/cpuapr2022.html","https://www.oracle.com/security-alerts/cpuApr2021.html","https://www.oracle.com//security-alerts/cpujul2021.html","https://www.openssl.org/news/secadv/20210325.txt","https://www.debian.org/security/2021/dsa-4875","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd","https://security.netapp.com/advisory/ntap-20210513-0002","https://security.netapp.com/advisory/ntap-20210326-0006","https://security.gentoo.org/glsa/202103-03","https://security.freebsd.org/advisories/FreeBSD-SA-21:07.openssl.asc","https://rustsec.org/advisories/RUSTSEC-2021-0055.html","https://rustsec.org/advisories/RUSTSEC-2021-0055","https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP","https://lists.debian.org/debian-lts-announce/2021/08/msg00029.html","https://kc.mcafee.com/corporate/index?page=content&id=SB10356","https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845","https://github.com/alexcrichton/openssl-src-rs","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fb9fa6b51defd48157eeb207f52181f735d96148","https://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","http://www.openwall.com/lists/oss-security/2021/03/27/1","http://www.openwall.com/lists/oss-security/2021/03/27/2","http://www.openwall.com/lists/oss-security/2021/03/28/3","http://www.openwall.com/lists/oss-security/2021/03/28/4"],"sourceUrl":"https://github.com/advisories/GHSA-83mx-573x-5rw9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-83mx-573x-5rw9","identifiers":["GHSA-83mx-573x-5rw9","BIT-node-2021-3449","BIT-node-min-2021-3449","CVE-2021-3449","RUSTSEC-2021-0055"]},"retained":false,"historicalAffected":[]},{"revision":"63890a1c729a44ee9d58f1f98e128230","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"RUSTSEC-2021-0055","aliases":["BIT-node-2021-3449","BIT-node-min-2021-3449","CVE-2021-3449","GHSA-83mx-573x-5rw9"],"title":"NULL pointer deref in signature_algorithms processing","description":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation\nClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits\nthe signature_algorithms extension (where it was present in the initial\nClientHello), but includes a signature_algorithms_cert extension then a NULL\npointer dereference will result, leading to a crash and a denial of service\nattack.\n\nA server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which\nis the default configuration). OpenSSL TLS clients are not impacted by this\nissue.","state":0,"publishedAt":"2021-05-01T12:00:00+00:00","modifiedAt":"2024-12-16T15:27:00.55712+00:00","affected":[{"ecosystem":"crates.io","name":"openssl-src","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.0.0-0"},{"kind":"fixed","version":"111.15.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null}],"references":["https://crates.io/crates/openssl-src","https://rustsec.org/advisories/RUSTSEC-2021-0055.html","https://www.openssl.org/news/secadv/20210325.txt"],"sourceUrl":"https://osv.dev/vulnerability/RUSTSEC-2021-0055","license":"OSV · upstream source license applies","key":"osv:RUSTSEC-2021-0055","identifiers":["RUSTSEC-2021-0055","BIT-node-2021-3449","BIT-node-min-2021-3449","CVE-2021-3449","GHSA-83mx-573x-5rw9"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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