5.3

CVE-2022-48437: openbsd libressl Improper Certificate Validation

CVSS: 5.3v3.1MediumModified
Published 12-04-2023Last modified 10-02-2025
Open JSON

Vulnerability summary

CVE-2022-48437 is a medium (CVSS 5.3) Improper Certificate Validation vulnerability in openbsd libressl. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 28.4% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.36%
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. 12-04-2023
    PublishedVulnerability first disclosed.
  2. 10-02-2025
    Last modifiedVulnerability information updated.

Description

An issue was discovered in x509/x509_verify.c in LibreSSL before 3.6.1, and in OpenBSD before 7.2 errata 001. x509_verify_ctx_add_chain does not store errors that occur during leaf certificate verification, and therefore an incorrect error is returned. This behavior occurs when there is an installed verification callback that instructs the verifier to continue upon detecting an invalid certificate.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

0.00 pp

From 0.36% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.36%

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

3 links