CVE-2017-7793

high-risk
Published 2018-06-11

A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

Do I need to act?

~
2.4% 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
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Debian Redhat Mozilla

References (24)

Third Party Advisory http://www.securityfocus.com/bid/101055
Third Party Advisory http://www.securitytracker.com/id/1039465
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2831
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2885
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1371889
Third Party Advisory https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
Third Party Advisory https://security.gentoo.org/glsa/201803-14
Third Party Advisory https://www.debian.org/security/2017/dsa-3987
Third Party Advisory https://www.debian.org/security/2017/dsa-4014
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-21/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-22/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-23/
Third Party Advisory http://www.securityfocus.com/bid/101055
Third Party Advisory http://www.securitytracker.com/id/1039465
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2831
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2885
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1371889
Third Party Advisory https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
Third Party Advisory https://security.gentoo.org/glsa/201803-14
Third Party Advisory https://www.debian.org/security/2017/dsa-3987
and 4 more references
58
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 6/34 · Minimal
Exposure 20/34 · Moderate