What’s Vulnerable › Vulnerabilities

CVE-2020-15685

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-77

Description

During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected and evaluated within the encrypted session. This vulnerability affects Thunderbird < 78.7.

Affected products

• Mozilla Thunderbird: before 78.7.0 — fixed in 78.7.0

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 78.7.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1622640
• https://www.mozilla.org/security/advisories/mfsa2021-05/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1622640
• https://www.mozilla.org/security/advisories/mfsa2021-05/

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