What’s Vulnerable › Vulnerabilities

CVE-2021-29948

• Severity: low (CVSS 2.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-24 · updated 2026-06-17
• Weakness: CWE-362

Description

Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file. This vulnerability affects Thunderbird < 78.10.

Affected products

• Mozilla Thunderbird: before 78.10 — fixed in 78.10

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 78.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1692899
• https://www.mozilla.org/security/advisories/mfsa2021-14/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1692899
• https://www.mozilla.org/security/advisories/mfsa2021-14/

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