What’s Vulnerable › Vulnerabilities

CVE-2022-0566

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-787

Description

It may be possible for an attacker to craft an email message that causes Thunderbird to perform an out-of-bounds write of one byte when processing the message. This vulnerability affects Thunderbird < 91.6.1.

Affected products

• Mozilla Thunderbird: before 91.6.1 — fixed in 91.6.1

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 91.6.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1753094
• https://www.mozilla.org/security/advisories/mfsa2022-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1753094
• https://www.mozilla.org/security/advisories/mfsa2022-07/

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