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)…
Exact source revision recorded 24 Oct 2026 18:17:33 UTC. It does not establish the source's current position. Latest evidence.
nvd · CVE-2021-3449
PublishedAn 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).
NVD 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.
Source analysis status: Modified
Weakness classifications: CWE-476
Original publisher date fields
published: 2021-03-25T15:15:13.450
lastModified: 2026-10-08T22:17:11.243
197 source CPE criteria · context only
- cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
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The original JSON retains the logical configuration operators, exclusions and version bounds.
- Source published
- 25 Mar 2021 15:15:13 UTC
- Source modified
- 8 Oct 2026 22:17:11 UTC
- Observed here
- 24 Oct 2026 18:17:33 UTC
- Source terms
- NIST NVD usage terms; underlying source attribution retained
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS 3.1 · [email protected] · Primary · 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 · [email protected] · Primary · 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P