CVE-2018-12377: canonical ubuntu_linux Use After Free
Vulnerability summary
CVE-2018-12377 is a critical (CVSS 9.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 3.36% chance of exploitation in the next 30 days, higher than 88.7% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 3% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 18 · Related 10Timeline
- 18-10-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
3.36%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.36% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.6
- enterprise_linux_server_eus7.5 | 7.6
- enterprise_linux_server_tus7.6
Debian3 products
- firefox-esr< 60.2.0esr-1
- thunderbird< 1:60.2.1-1
- debian_linuxEOL8.0 | 9.0
Mozilla3 products
- firefox≥ unspecified, < 62 | < 60.2.0 | < 62.0
- firefox esr≥ unspecified, < 60.2
- thunderbird≥ unspecified, < 60.2.1 | < 60.2.1
Ubuntu2 products
- firefox< 62.0+build2-0ubuntu0.14.04.3 | < 62.0+build2-0ubuntu0.16.04.3 | < 62.0+build2-0ubuntu0.18.04.3
- thunderbird< 1:60.2.1+build1-0ubuntu0.14.04.2 | < 1:60.2.1+build1-0ubuntu0.16.04.4 | < 1:60.2.1+build1-0ubuntu0.18.04.2
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04
5 vendors · 15 products
References
25 links
lists.debian.org/debian-lts-announce/2018/11/msg00011.htmlMailing ListX Refsource MLISTThird Party Advisory- bugzilla.mozilla.org/show_bug.cgi?id=1470260X Refsource CONFIRMIssue TrackingPermissions RequiredVendor Advisory