CVE-2016-5287: mozilla firefox Use After Free
Vulnerability summary
CVE-2016-5287 is a critical (CVSS 9.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 2.35% chance of exploitation in the next 30 days, higher than 83.6% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 3Timeline
- 11-06-2018PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
A potentially exploitable use-after-free crash during actor destruction with service workers. This issue does not affect releases earlier than Firefox 49. This vulnerability affects Firefox < 49.0.2.
CVSS metrics
3 scores · 2 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
EPSS trend
Probability
2.35%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
Decrease -0.05 pp
From 2.39% 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.
Mozilla1 product
- firefox≥ unspecified, < 49.0.2 | < 49.0.2
Ubuntu1 product
- firefox< 49.0.2+build2-0ubuntu0.14.04.1 | < 49.0.2+build2-0ubuntu0.16.04.2
2 vendors · 2 products