What’s Vulnerable › Vulnerabilities

CVE-2020-6795

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-02 · updated 2026-06-17
• Weakness: CWE-476

Description

When processing a message that contains multiple S/MIME signatures, a bug in the MIME processing code caused a null pointer dereference, leading to an unexploitable crash. This vulnerability affects Thunderbird < 68.5.

Affected products

• Mozilla Thunderbird: before 68.5.0 — fixed in 68.5.0

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 68.5.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1611105
• https://security.gentoo.org/glsa/202003-10
• https://usn.ubuntu.com/4328-1/
• https://usn.ubuntu.com/4335-1/
• https://www.mozilla.org/security/advisories/mfsa2020-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1611105
• https://security.gentoo.org/glsa/202003-10
• https://usn.ubuntu.com/4328-1/
• https://usn.ubuntu.com/4335-1/
• https://www.mozilla.org/security/advisories/mfsa2020-07/

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