CVE Database›CVE-2023-5171

CVE-2023-5171

Mozilla: Use-after-free in Ion Compiler

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Severity

Important

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · September 26, 2023

Updated · November 22, 2025

Description

A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes this flaw as: During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NULL bytes and cause a potentially exploitable crash.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

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 3.1 · 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE-416 · Use After Free