CVE-2021-3449

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

63.54% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.1% of scored records. A rank, not a probability.

NVD base score

5.9 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-10-08.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-03-25 14:25Z5 YR AGO

Last updated

2026-10-08 21:13Z20 DAYS AGO

Reserved

2021-03-17

Assigning CNA

openssl

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

79b7b8e067e496a6a7efbd19aac07329882bfba86f2d99c61b0f8b5c90f4e5fb

• www.openssl.orghttps://www.openssl.org/news/secadv/20210325.txt
• git.openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=fb9fa6b51defd48157eeb207f52181f735d96148
• tools.cisco.com20210325 Multiple Vulnerabilities in OpenSSL Affecting Cisco Products: March 2021https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJdvendor-advisory
• www.debian.orgDSA-4875https://www.debian.org/security/2021/dsa-4875vendor-advisory
• www.openwall.com[oss-security] 20210327 OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processinghttp://www.openwall.com/lists/oss-security/2021/03/27/1mailing-list
• www.openwall.com[oss-security] 20210327 Re: OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processinghttp://www.openwall.com/lists/oss-security/2021/03/27/2mailing-list
• www.openwall.com[oss-security] 20210328 Re: OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processinghttp://www.openwall.com/lists/oss-security/2021/03/28/3mailing-list
• www.openwall.com[oss-security] 20210328 Re: OpenSSL 1.1.1 CVE-2021-3450 CA certificate check bypass with X509_V_FLAG_X509_STRICT, CVE-2021-3449 NULL pointer deref in signature_algorithms processinghttp://www.openwall.com/lists/oss-security/2021/03/28/4mailing-list
• security.gentoo.orgGLSA-202103-03https://security.gentoo.org/glsa/202103-03vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-cbf14ab8f9https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/vendor-advisory
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuApr2021.html
• www.tenable.comhttps://www.tenable.com/security/tns-2021-10
• www.tenable.comhttps://www.tenable.com/security/tns-2021-09
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210513-0002/
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210326-0006/
• security.freebsd.orghttps://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc
• www.tenable.comhttps://www.tenable.com/security/tns-2021-06
• www.tenable.comhttps://www.tenable.com/security/tns-2021-05
• kc.mcafee.comhttps://kc.mcafee.com/corporate/index?page=content&id=SB10356
• www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.html
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-772220.pdf
• kb.pulsesecure.nethttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845
• psirt.global.sonicwall.comhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013
• lists.debian.org[debian-lts-announce] 20210831 [SECURITY] [DLA 2751-1] postgresql-9.6 security updatehttps://lists.debian.org/debian-lts-announce/2021/08/msg00029.htmlmailing-list
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.html
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.html
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20240621-0006/