CVE-2021-44964

MediumPublic PoC

Published: 14 March 2022

Published

14 March 2022

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 6.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H

EPSS Score 0.0015 35.6th percentile

Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-44964 is a medium-severity Use After Free (CWE-416) vulnerability in Lua Lua. Its CVSS base score is 6.3 (Medium).

Operationally, ranked at the 35.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2021-31762

Vulnerability details

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.

CWE(s): CWE-416

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

lua

5.4.0 — 5.4.3

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection

addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

References

http://lua-users.org/lists/lua-l/2021-11/msg00186.html
Exploit, Mailing List, Technical Description, Vendor Advisory · cve@mitre.org
http://lua-users.org/lists/lua-l/2021-12/msg00007.html
Exploit, Mailing List, Vendor Advisory · cve@mitre.org
http://lua-users.org/lists/lua-l/2021-12/msg00015.html
Mailing List, Vendor Advisory · cve@mitre.org
http://lua-users.org/lists/lua-l/2021-12/msg00030.html
Mailing List, Vendor Advisory · cve@mitre.org
https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability
Exploit, Third Party Advisory · cve@mitre.org
http://lua-users.org/lists/lua-l/2021-11/msg00186.html
Exploit, Mailing List, Technical Description, Vendor Advisory · af854a3a-2127-422b-91ae-364da2661108
http://lua-users.org/lists/lua-l/2021-12/msg00007.html
Exploit, Mailing List, Vendor Advisory · af854a3a-2127-422b-91ae-364da2661108
http://lua-users.org/lists/lua-l/2021-12/msg00015.html
Mailing List, Vendor Advisory · af854a3a-2127-422b-91ae-364da2661108
http://lua-users.org/lists/lua-l/2021-12/msg00030.html
Mailing List, Vendor Advisory · af854a3a-2127-422b-91ae-364da2661108
https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability
Exploit, Third Party Advisory · af854a3a-2127-422b-91ae-364da2661108