CVE-2016-5277: mozilla firefox Use After Free
Vulnerability summary
CVE-2016-5277 is a critical (CVSS 9.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 4.01% chance of exploitation in the next 30 days, higher than 90.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 12 · Related 7Timeline
- 22-09-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
Use-after-free vulnerability in the nsRefreshDriver::Tick function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) by leveraging improper interaction between timeline destruction and the Web Animations model implementation.
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
4.01%
Chance of exploitation in the next 30 days
Percentile
90%
Versus all other CVEs
30-day change
0.00 pp
From 4.01% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu2 products
- firefox< 49.0+build4-0ubuntu0.14.04.1 | < 49.0+build4-0ubuntu0.16.04.1
- thunderbird< 1:45.4.0+build1-0ubuntu0.14.04.1 | < 1:45.4.0+build1-0ubuntu0.16.04.1
Debian1 product
- firefox-esr< 45.4.0esr-1
Mozilla1 product
- firefox≤ 48.0.2 | 45.1.0 | 45.1.1 | 45.2.0 | 45.3.0
3 vendors · 4 products
References
16 links- www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.htmlX Refsource CONFIRM
- www.mozilla.org/security/advisories/mfsa2016-86/X Refsource CONFIRM
- www.mozilla.org/security/advisories/mfsa2016-88/X Refsource CONFIRM