CVE-2019-11745

nss: Out-of-bounds write when passing an output buffer smaller than the block size to NSC_EncryptUpdate

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Severity

Important

Red Hat Product Security

8.1

CVSS 3.0

Review impact separately from score.

Published · November 21, 2019

Updated · June 27, 2026

Description

A heap-based buffer overflow was found in the NSC_EncryptUpdate() function in Mozilla nss. A remote attacker could trigger this flaw via SRTP encrypt or decrypt operations, to execute arbitrary code with the permissions of the user running the application (compiled with nss). While the attack complexity is high, the impact to confidentiality, integrity, and availability are high as well.

Statement

Firefox and Thunderbird on Red Hat Enterprise Linux are built against the system nss library.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 8.1
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-787 · Out-of-bounds Write