6.5

CVE-2023-0547: mozilla thunderbird Improper Certificate Validation

CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2023-0547DEBIAN-CVE-2023-0547
Published 02-06-2023Last modified 10-01-2025
Open JSON

Vulnerability summary

CVE-2023-0547 is a medium (CVSS 6.5) Improper Certificate Validation vulnerability in mozilla thunderbird. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.6% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 3
DLA-3400-1DSA-5392-1MGASA-2023-0147OPENSUSE-SU-2024:12852-1RHSA-2023:1802RHSA-2023:1803

Timeline

  1. 02-06-2023
    PublishedVulnerability first disclosed.
  2. 10-01-2025
    Last modifiedVulnerability information updated.

Description

OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be accepted. Thunderbird versions from 68 to 102.9.1 were affected by this bug. This vulnerability affects Thunderbird < 102.10.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

0.00 pp

From 0.37% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.37%

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

Debian1 product
  • thunderbird< 1:102.10.0-1
Mozilla1 product
  • thunderbird≥ unspecified, < 102.10 | ≥ 68.0, < 102.10
Ubuntu1 product
  • thunderbird< 1:102.10.0+build2-0ubuntu0.18.04.1 | < 1:102.10.0+build2-0ubuntu0.20.04.1 | < 1:102.10.0+build2-0ubuntu0.22.04.1

3 vendors · 3 products

References

7 links