CVE-2016-5280

critical
Published 2016-09-22 · Modified 2026-05-06
CVSS v3
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v2
7.5
VIR risk
9.8

Description

Use-after-free vulnerability in the mozilla::nsTextNodeDirectionalityMap::RemoveElementFromMap 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 via bidirectional text.

Predictions

Exploit likelihood
97%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2016-5280

vendor Authored 2026-05-27

Vendor advisory: security@mozilla.org — http://www.mozilla.org/security/announce/2016/mfsa2016-85.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201609-22

OS impact

OSVersionStatusFixed in
arch archfixed49.0-1
debian debiansidfixed49.0-1
debian debianbookwormfixed45.4.0esr-1
debian debianbullseyefixed45.4.0esr-1
debian debianforkyfixed45.4.0esr-1
debian debiantrixiefixed45.4.0esr-1

Application impact

VendorProductVersionsFixed
mozilla mozillafirefox{"endIncluding":"48.0.2"}
mozilla mozillafirefox45.0
mozilla mozillafirefox45.0.1
mozilla mozillafirefox45.0.2
mozilla mozillafirefox45.1.1
mozilla mozillafirefox45.2.0
mozilla mozillafirefox45.3.0

References

CWEs

CWE-416

Verify integrity in audit chain (admin only). AS-IS.