What’s Vulnerable › Vulnerabilities

CVE-2019-11755

• Severity: high (CVSS 7.5 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: 2019-09-27 · updated 2026-06-17
• Weakness: CWE-347

Description

A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird < 68.1.1.

Affected products

• Mozilla Thunderbird: before 68.1.1 — fixed in 68.1.1

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 68.1.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1240290
• https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html
• https://seclists.org/bugtraq/2019/Nov/24
• https://usn.ubuntu.com/4202-1/
• https://usn.ubuntu.com/4335-1/
• https://www.debian.org/security/2019/dsa-4571
• https://www.mozilla.org/security/advisories/mfsa2019-32/
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1240290

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