What’s Vulnerable › Vulnerabilities

CVE-2021-46880

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-04-15 · updated 2026-06-17
• Weakness: CWE-295

Description

x509/x509_verify.c in LibreSSL before 3.4.2, and OpenBSD before 7.0 errata 006, allows authentication bypass because an error for an unverified certificate chain is sometimes discarded.

Affected products

• OpenBSD Libressl: before 3.4.2 — fixed in 3.4.2
• OpenBSD: before 7.0 — fixed in 7.0

How to fix

Upgrade to a fixed version: OpenBSD Libressl 3.4.2; OpenBSD 7.0. Check the vendor advisory for mitigations.

References

• https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.4.2-relnotes.txt
• https://ftp.openbsd.org/pub/OpenBSD/patches/7.0/common/006_x509.patch.sig
• https://github.com/openbsd/src/commit/3f851282810fa0ab4b90b3b1ecec2e8717ef16f8
• https://security.netapp.com/advisory/ntap-20230517-0006/
• https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.4.2-relnotes.txt
• https://ftp.openbsd.org/pub/OpenBSD/patches/7.0/common/006_x509.patch.sig
• https://github.com/openbsd/src/commit/3f851282810fa0ab4b90b3b1ecec2e8717ef16f8
• https://security.netapp.com/advisory/ntap-20230517-0006/

Get alerted when CVE-2021-46880 or the next vulnerability affects your stack