What’s Vulnerable › Vulnerabilities

CVE-2020-6794

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-03-02 · updated 2026-06-17
• Weakness: CWE-312

Description

If a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Thunderbird 60. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations. This vulnerability affects Thunderbird < 68.5.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.10
• 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=1606619
• 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=1606619
• 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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