What’s Vulnerable › Vulnerabilities

CVE-2021-44964

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-14 · updated 2026-06-17
• Weakness: CWE-416

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.

Affected products

• Lua: from 5.4.0 through 5.4.3

References

• http://lua-users.org/lists/lua-l/2021-11/msg00186.html
• http://lua-users.org/lists/lua-l/2021-12/msg00007.html
• http://lua-users.org/lists/lua-l/2021-12/msg00015.html
• http://lua-users.org/lists/lua-l/2021-12/msg00030.html
• https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability
• http://lua-users.org/lists/lua-l/2021-11/msg00186.html
• http://lua-users.org/lists/lua-l/2021-12/msg00007.html
• http://lua-users.org/lists/lua-l/2021-12/msg00015.html
• http://lua-users.org/lists/lua-l/2021-12/msg00030.html
• https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability

Get alerted when CVE-2021-44964 or the next vulnerability affects your stack