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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

Published

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).

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:*:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:12.2:-:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:12.2:p1:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:12.2:p2:*:*:*:*:*:*
  • cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*
  • cpe:2.3:a:netapp:cloud_volumes_ontap_mediator:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:e-series_performance_analyzer:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:oncommand_insight:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*
  • cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
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  • cpe:2.3:a:netapp:snapcenter:-:*:*:*:*:*:*:*
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  • cpe:2.3:a:tenable:log_correlation_engine:*:*:*:*:*:*:*:*
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  • cpe:2.3:a:tenable:nessus_network_monitor:5.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
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  • cpe:2.3:a:mcafee:web_gateway:10.1.1:*:*:*:*:*:*:*
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  • cpe:2.3:o:checkpoint:quantum_security_gateway_firmware:r80.40:*:*:*:*:*:*:*
  • cpe:2.3:o:checkpoint:quantum_security_gateway_firmware:r81:*:*:*:*:*:*:*
  • cpe:2.3:h:checkpoint:quantum_security_gateway:-:*:*:*:*:*:*:*
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  • cpe:2.3:a:oracle:mysql_connectors:*:*:*:*:*:*:*:*
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  • cpe:2.3:a:oracle:secure_backup:*:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:secure_global_desktop:5.6:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
  • cpe:2.3:o:sonicwall:sma100_firmware:*:*:*:*:*:*:*:*
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  • cpe:2.3:a:sonicwall:capture_client:3.5:*:*:*:*:*:*:*
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  • cpe:2.3:h:siemens:scalance_s623:-:*:*:*:*:*:*:*
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  • cpe:2.3:h:siemens:scalance_s627-2m:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_sc-600_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_sc-600:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_w700_firmware:*:*:*:*:*:*:*:*
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  • cpe:2.3:o:siemens:scalance_w1700_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_w1700:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xb-200_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xb-200:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xc-200_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xc-200:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xf-200ba_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xf-200ba:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xm-400_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xm-400:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xp-200_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xp-200:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xr-300wg_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xr-300wg:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xr524-8c_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xr524-8c:-:*:*:*:*:*:*:*
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  • cpe:2.3:h:siemens:scalance_xr526-8c:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xr528-6m_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xr528-6m:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:scalance_xr552-12_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:scalance_xr552-12:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_cloud_connect_7_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_cloud_connect_7_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_cloud_connect_7:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_cp_1242-7_gprs_v2_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_cp_1242-7_gprs_v2_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_cp_1242-7_gprs_v2:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_hmi_basic_panels_2nd_generation_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_hmi_basic_panels_2nd_generation:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_hmi_comfort_outdoor_panels:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_hmi_ktp_mobile_panels:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_mv500_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_mv500:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp_1243-1_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp_1243-1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp1243-7_lte_eu_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp1243-7_lte_eu:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp1243-7_lte_us_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp1243-7_lte_us:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp_1243-8_irc_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp_1243-8_irc:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp_1542sp-1_irc_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp_1542sp-1_irc:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp_1543-1_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp_1543-1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp_1543sp-1_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp_1543sp-1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_net_cp_1545-1_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_net_cp_1545-1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_pcs_7_telecontrol_firmware:*:*:*:*:*:*:*:*
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  • cpe:2.3:o:siemens:simatic_pcs_neo_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_pcs_neo:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_pdm_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_pdm:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_process_historian_opc_ua_server_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_process_historian_opc_ua_server:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_rf166c_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_rf166c:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_rf185c_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_rf185c:-:*:*:*:*:*:*:*
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  • cpe:2.3:h:siemens:simatic_rf186c:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_rf186ci_firmware:*:*:*:*:*:*:*:*
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  • cpe:2.3:h:siemens:simatic_rf188c:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_rf188ci_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:siemens:simatic_rf188ci:-:*:*:*:*:*:*:*
  • cpe:2.3:o:siemens:simatic_rf360r_firmware:*:*:*:*:*:*:*:*
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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

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 10 Nov 14:45 UTC · 275 of 275 readable · 274 fully read · documentation 469/469 current