CVE-2019-11759

HIGH

Firefox < 70, Thunderbird < 68.2, Firefox ESR < 68.2 - Buffer Overflow

Title source: llm
STIX 2.1

Description

An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

References (6)

Core 6
Core References
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2019-35/
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2019-33/
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2019-34/
Issue Tracking, Permissions Required x_refsource_confirm
https://bugzilla.mozilla.org/show_bug.cgi?id=1577953
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202003-10
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4335-1/

Scores

CVSS v3 8.8
EPSS 0.0251
EPSS Percentile 85.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-120
Status published
Products (4)
canonical/ubuntu_linux 16.04
mozilla/firefox < 70.0
mozilla/firefox_esr < 68.2
mozilla/thunderbird < 68.2
Published Jan 08, 2020
Tracked Since Feb 18, 2026