CVE-2019-11757

moderate-risk
Published 2020-01-08

When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

Do I need to act?

~
1.4% 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
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (4)

Affected Vendors

Mozilla Canonical

References (12)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1577107
Third Party Advisory https://security.gentoo.org/glsa/202003-10
Third Party Advisory https://usn.ubuntu.com/4335-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-33/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-34/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-35/
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1577107
Third Party Advisory https://security.gentoo.org/glsa/202003-10
Third Party Advisory https://usn.ubuntu.com/4335-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-33/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-34/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2019-35/
44
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 4/34 · Minimal
Exposure 10/34 · Low