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Vulnerability record · CVE-2021-44647 · published 11 January 2022

CVE-2021-44647: Lua type confusion vulnerability

Lua · Lua

Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.

5.5 CVSS 3.1 Medium EPSS 0.42% · top 66.3% CWE-843 · Type confusion
5.5CVSS 3.1 base score, v2 2.1
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Lua v5.4.3 and above are affected by SEGV by type confusion in funcnamefromcode function in ldebug.c which can cause a local denial of service.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lua-users.org/lists/lua-l/2021-11/msg00195.html ExploitMailing ListVendor Advisory
http://lua-users.org/lists/lua-l/2021-11/msg00204.html Mailing ListPatchVendor Advisory
https://access.redhat.com/security/cve/cve-2021-44647 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOE
https://security.gentoo.org/glsa/202305-23
http://lua-users.org/lists/lua-l/2021-11/msg00195.html ExploitMailing ListVendor Advisory
http://lua-users.org/lists/lua-l/2021-11/msg00204.html Mailing ListPatchVendor Advisory
https://access.redhat.com/security/cve/cve-2021-44647 Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOE
https://security.gentoo.org/glsa/202305-23

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-44647), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.