What is CVE-2014-1486?

CVE-2014-1486 is a critical-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 9.8/10. Published 2014-02-06.

How severe is CVE-2014-1486?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Mozilla Firefox

CVE-2014-1486

Use-after-free vulnerability in the imgRequestProxy function in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, and SeaMonkey before 2.24 allows remote attackers to execute arbitrary code via vectors involving unspecified Content-Type values for image data.

Vulnerability class: Use-After-Free

Published 2014-02-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.071 (94.1th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.071 · newest: 0.071 · change: 0.000

Affected products

Mozilla Firefox
Mozilla Seamonkey
Mozilla Thunderbird
Canonical Ubuntu Linux — versions 12.04, 12.10, 13.10
Debian Linux — versions 7.0
Fedoraproject Fedora — versions 19, 20
openSUSE — versions 11.4, 12.3, 13.1
Red Hat Enterprise Linux Desktop — versions 6.0
Red Hat Enterprise Linux Eus — versions 6.5
Red Hat Enterprise Linux Server — versions 6.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

www.ubuntu.com/usn/USN-2119-1 (vendor-advisory, Third Party Advisory)
download.novell.com/Download (Broken Link)
www.securitytracker.com/id/1029721 (VDB Entry, Third Party Advisory, vdb-entry)
bugzilla.mozilla.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2014-02/msg00004.html (vendor-advisory, Mailing List, Third Party Advisory)
www.securitytracker.com/id/1029717 (VDB Entry, Third Party Advisory, vdb-entry)
8pecxstudios.com/ (URL Repurposed, Broken Link)
rhn.redhat.com/errata/RHSA-2014-0132.html (vendor-advisory, Third Party Advisory)
secunia.com/advisories/56922 (Broken Link, third-party-advisory)
secunia.com/advisories/56787 (Broken Link, third-party-advisory)

Frequently asked questions

What is CVE-2014-1486?: CVE-2014-1486 is a critical-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 9.8/10. Published 2014-02-06.
How severe is CVE-2014-1486?: Critical severity. CVSS v3 base score is 9.8 out of 10.