PT-2022-12190 · Lua+1 · Lua+1

Kang Woosun · Published 2022-01-11 · Updated 2025-08-03 · CVE-2021-44647

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Lua versions 5.4.2 through 5.4.4

Description The issue is related to a type confusion in the funcnamefromcode function in ldebug.c, which can cause a local denial of service due to a SEGV.

Recommendations For Lua versions 5.4.2 through 5.4.4, consider disabling the funcnamefromcode function in ldebug.c as a temporary workaround until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Type Confusion

Weakness Enumeration

CWE-843

Related Identifiers

AZL-41327

AZL-41797

AZL-9317

BIT-LUA-2021-44647

CVE-2021-44647

OESA-2022-1632

OPENSUSE-SU-2024:12156-1

OPENSUSE-SU-2025:15401-1

Affected Products

Debian

Lua

References · 31

• 🔥 http://lua-users.org/lists/lua-l/2021-11/msg00195.html · Exploit
• https://osv.dev/vulnerability/AZL-9317 · Vendor Advisory
• https://osv.dev/vulnerability/AZL-41327 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-44647 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15401-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOEQT4MZ4J4F · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-44647 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-44647 · Security Note
• https://osv.dev/vulnerability/CVE-2021-44647 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2022-1632 · Vendor Advisory
• http://lua-users.org/lists/lua-l/2021-11/msg00204.html · Vendor Advisory
• https://security.gentoo.org/glsa/202305-23 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-28805 · Security Note
• https://osv.dev/vulnerability/AZL-41797 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-lua-2021-44647 · Vendor Advisory