CVE-2016-5261

Severity: high (CVSS 8.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-08-05 · updated 2026-06-17
Weakness: CWE-190

Description

Integer overflow in the WebSocketChannel class in the WebSockets subsystem in Mozilla Firefox before 48.0 and Firefox ESR < 45.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets that trigger incorrect buffer-resize operations during buffering.

Affected products

Mozilla Firefox: through 47.0.1

References

http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00029.html
http://rhn.redhat.com/errata/RHSA-2016-1912.html
http://www.debian.org/security/2016/dsa-3674
http://www.mozilla.org/security/announce/2016/mfsa2016-75.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
http://www.securityfocus.com/bid/92260
http://www.securitytracker.com/id/1036508
http://www.ubuntu.com/usn/USN-3044-1
https://bugzilla.mozilla.org/show_bug.cgi?id=1287266
https://security.gentoo.org/glsa/201701-15
https://www.mozilla.org/security/advisories/mfsa2016-86/

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