What’s Vulnerable › Vulnerabilities

CVE-2018-5161

• Severity: medium (CVSS 4.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-20

Description

Crafted message headers can cause a Thunderbird process to hang on receiving the message. This vulnerability affects Thunderbird ESR < 52.8 and Thunderbird < 52.8.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10, 18.04
• Debian Linux: 7.0, 8.0, 9.0
• Mozilla Thunderbird: before 52.8.0 — fixed in 52.8.0
• Mozilla Thunderbird ESR: before 52.8 — fixed in 52.8
• RedHat Enterprise Linux Desktop: 6.0, 7.0
• RedHat Enterprise Linux Server: 6.0, 7.0
• RedHat Enterprise Linux Server Aus: 7.6
• RedHat Enterprise Linux Server Eus: 7.5, 7.6
• RedHat Enterprise Linux Server Tus: 7.6
• RedHat Enterprise Linux Workstation: 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 52.8.0; Mozilla Thunderbird ESR 52.8. Check the vendor advisory for mitigations.

References

• http://www.securitytracker.com/id/1040946
• https://access.redhat.com/errata/RHSA-2018:1725
• https://access.redhat.com/errata/RHSA-2018:1726
• https://bugzilla.mozilla.org/show_bug.cgi?id=1411720
• https://lists.debian.org/debian-lts-announce/2018/05/msg00013.html
• https://security.gentoo.org/glsa/201811-13
• https://usn.ubuntu.com/3660-1/
• https://www.debian.org/security/2018/dsa-4209
• https://www.mozilla.org/security/advisories/mfsa2018-13/
• http://www.securitytracker.com/id/1040946
• https://access.redhat.com/errata/RHSA-2018:1725
• https://access.redhat.com/errata/RHSA-2018:1726

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