CVE-2018-12393

high-risk
Published 2019-02-28

A potential vulnerability was found in 32-bit builds where an integer overflow during the conversion of scripts to an internal UTF-16 representation could result in allocating a buffer too small for the conversion. This leads to a possible out-of-bounds write. *Note: 64-bit builds are not vulnerable to this issue.*. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.

Do I need to act?

~
5.8% 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
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (18)

Affected Vendors

Debian Redhat Mozilla Canonical

References (38)

Third Party Advisory http://www.securityfocus.com/bid/105718
Third Party Advisory http://www.securityfocus.com/bid/105769
Third Party Advisory http://www.securitytracker.com/id/1041944
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3005
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3006
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3531
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3532
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1495011
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
Third Party Advisory https://security.gentoo.org/glsa/201811-04
Third Party Advisory https://security.gentoo.org/glsa/201811-13
Third Party Advisory https://usn.ubuntu.com/3801-1/
Third Party Advisory https://usn.ubuntu.com/3868-1/
Third Party Advisory https://www.debian.org/security/2018/dsa-4324
Third Party Advisory https://www.debian.org/security/2018/dsa-4337
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-26/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-27/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-28/
Third Party Advisory http://www.securityfocus.com/bid/105718
and 18 more references
54
/ 100
high-risk
Severity 26/34 · High
Exploitability 9/34 · Low
Exposure 19/34 · Moderate