What’s Vulnerable › Vulnerabilities

CVE-2018-5156

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-10-18 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring. This can result in stream data being cast to the wrong type causing a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10, 18.04
• Debian Linux: 8.0, 9.0
• Mozilla Firefox: before 52.9.0; before 61.0; from 52.9.1 before 60.1.0 — fixed in 52.9.0, 60.1.0, 61.0
• Mozilla Thunderbird: before 60.0 — fixed in 60.0
• 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 Firefox 52.9.0, 60.1.0, 61.0; Mozilla Thunderbird 60.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/104560
• http://www.securitytracker.com/id/1041193
• https://access.redhat.com/errata/RHSA-2018:2112
• https://access.redhat.com/errata/RHSA-2018:2113
• https://bugzilla.mozilla.org/show_bug.cgi?id=1453127
• https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
• https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
• https://security.gentoo.org/glsa/201810-01
• https://security.gentoo.org/glsa/201811-13
• https://usn.ubuntu.com/3705-1/
• https://www.debian.org/security/2018/dsa-4235
• https://www.debian.org/security/2018/dsa-4295

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