CVE-2017-7756

moderate-risk

Published 2018-06-11

A use-after-free and use-after-scope vulnerability when logging errors from headers for XML HTTP Requests (XHR). This could result in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

Do I need to act?

1.9% 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 (4)

Firefox

Thunderbird

Debian Linux

Affected Vendors

Debian Mozilla

References (20)

Third Party Advisory http://www.securityfocus.com/bid/99057

Third Party Advisory http://www.securitytracker.com/id/1038689

Third Party Advisory https://access.redhat.com/errata/RHSA-2017:1440

Third Party Advisory https://access.redhat.com/errata/RHSA-2017:1561

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1366595

Third Party Advisory https://www.debian.org/security/2017/dsa-3881

Third Party Advisory https://www.debian.org/security/2017/dsa-3918

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-15/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-16/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-17/