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CVE-2021-44964Use 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…
- 6.3MediumCVSS base score
- 0.98%Exploitation in 30 daysEPSS · top 37% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 3 months later
· 3 months later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium6.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.98% · top 37% of all CVEs (15 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Affected products
n/a
- affected n/a
References
References5
- http://lua-users.org/lists/lua-l/2021-11/msg00186.html (opens in a new tab)x_refsource_MISCx_transferred
- http://lua-users.org/lists/lua-l/2021-12/msg00007.html (opens in a new tab)x_refsource_MISCx_transferred
- http://lua-users.org/lists/lua-l/2021-12/msg00015.html (opens in a new tab)x_refsource_MISCx_transferred
- http://lua-users.org/lists/lua-l/2021-12/msg00030.html (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/Lua-Project/lua-5.4.4-sandbox-escape-with-new-vulnerability (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-31762 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-44964)Record last updated .