CVE-2016-5270

high-risk

Published 2016-09-22

Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.

Do I need to act?

4.1% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (5)

Firefox

Affected Vendors

Mozilla

References (20)

http://rhn.redhat.com/errata/RHSA-2016-1912.html

http://www.debian.org/security/2016/dsa-3674

Vendor Advisory http://www.mozilla.org/security/announce/2016/mfsa2016-85.html

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.h...

http://www.securityfocus.com/bid/93049

http://www.securitytracker.com/id/1036852

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1291016

https://security.gentoo.org/glsa/201701-15

https://www.mozilla.org/security/advisories/mfsa2016-86/

https://www.mozilla.org/security/advisories/mfsa2016-88/