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9.8

CVE-2018-5091: Firefox Crashes When Using WebRTC on Older Versions

CVE-2018-5091 · published 8 years ago
Summary

Using older versions of Firefox can cause the browser to crash when making voice calls or using other WebRTC features. This can leave you unable to use your browser until you restart it. Update to the latest version of Firefox to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
debian debian_linux 7.0
8.0
9.0
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 6.0
7.0
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0
7.0
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0
7.0
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.3
7.4
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.3
7.4
7.5
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0
7.0
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
mozilla firefox < 58.0
< 52.6.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04
16.04
17.10
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
Original advisory text
A use-after-free vulnerability can occur during WebRTC connections when interacting with the DTMF timers. This results in a potentially exploitable crash. This vulnerability affects Firefox ESR < 5...
A use-after-free vulnerability can occur during WebRTC connections when interacting with the DTMF timers. This results in a potentially exploitable crash. This vulnerability affects Firefox ESR < 52.6 and Firefox < 58.
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Exploitation
3% chance of attack within 30 days
Type
CWE-416Use After Free
Timeline
Published11 Jun 2018
Updated4 Nov 2026
First seen15 Mar 2026
Sources
CVE-2018-5091 · OSV
CVE-2018-5091 · NVD
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