9.8

CVE-2021-46880: openbsd libressl Improper Certificate Validation

CVSS: 9.8v3.1CriticalModified
Published 14-04-2023Last modified 07-02-2025
Open JSON

Vulnerability summary

CVE-2021-46880 is a critical (CVSS 9.8) Improper Certificate Validation vulnerability in openbsd libressl. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 45.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.57%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-04-2023
    PublishedVulnerability first disclosed.
  2. 07-02-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

0.00 pp

From 0.57% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Openbsd2 products

1 vendor · 2 products

References

4 links