CVE-2016-5259
8.8
HIGH
CVSS 3.1
EPSS 3.3%
Description
Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.
How to fix CVE-2016-5259
To remediate CVE-2016-5259, upgrade the affected package to a fixed version below.
- Debian/firefox-esr—upgrade to 45.3.0esr-1 or later
Is CVE-2016-5259 being exploited?
Low — EPSS is 3.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 45.3.0esr-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |