🛡️ CVE-2021-44964 on Debian — lua5.4

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Use after free in garbage collector and finalizer of lgc.c in Lua interpreter 5.4.0~5.4.3 allows attackers to perform Sandbox Escape via a crafted script file.

Distribution advisory

This page covers CVE-2021-44964 as tracked by Debian, for the package lua5.4. The fix is available in version 5.4.4-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity none, availability high.

Affected software

DEBIAN-CVE-2021-44964 is recorded against 1 package.

lua5.4 (fixed in 5.4.4-1)

Timeline and source

Published on 14 March 2022 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2021-44964 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Base record Ubuntu

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2022-03-14

Updated 2026-08-12

Modified 2026-08-04

Fix URL N/A

Affected Packages

Software	From version	Fixed in
lua5.4	—	5.4.4-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2021-44964

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