Skip to main content
No exploitation reportedFix available

CVE-2021-44964

No exploitation reported by the sources we read.

  • Published2022-03-14
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC
  1. 2022-03-1415:15CVE publishedNVD

Versions per branch

NVD · OSV
Lua
BranchAffectedFixed in
5.4≥ 5.4.0, ≤ 5.4.3no fix published
lua
BranchAffectedFixed in
5.4≥ 5.4.0, < 5.4.45.4.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • luaRocky Linux:9all versions · fixed in 0:5.4.4-2.el9_1
  • luaRed Hat:rhel_eus:9.0::crball versions · fixed in 0:5.4.4-1.el9_0.1and 4 other packages
  • luaRed Hat:rhel_eus:9.0::baseosall versions · fixed in 0:5.4.4-1.el9_0.1and 4 other packages
  • luaRed Hat:rhel_eus:9.0::appstreamall versions · fixed in 0:5.4.4-1.el9_0.1and 3 other packages
  • luaRed Hat:enterprise_linux:9::crball versions · fixed in 0:5.4.4-2.el9_1and 4 other packages
  • luaRed Hat:enterprise_linux:9::baseosall versions · fixed in 0:5.4.4-2.el9_1and 4 other packages
  • luaRed Hat:enterprise_linux:9::appstreamall versions · fixed in 0:5.4.4-2.el9_1and 3 other packages
  • luaopenEuler:22.03-LTSall versions · fixed in 5.4.3-8.oe2203

10 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-44964 Red Hat Product Security116 products fixed

    lua: use after free allows Sandbox Escape

  • RHSA-2023:1211 Red Hat Product Security58 products fixed

    Red Hat Security Advisory: lua security update

  • RHSA-2023:0957 Red Hat Product Security58 products fixed

    Red Hat Security Advisory: lua security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2023:1211 · 58 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Workaround from the vendor Red Hat Product Security RHSA-2023:1211 · 58 productsEnsure that the Lua interpreter runs only trusted scripts.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Published
2022-03-14
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-rvj2-9p3c-wmwh

Frequently asked questions

What is CVE-2021-44964?

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.

Is CVE-2021-44964 actively exploited?

Active exploitation of CVE-2021-44964 has not been confirmed. Its EPSS score was 1.0% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-44964?

CVE-2021-44964 has a CVSS v3 base score of 6.3 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H.

Running lua? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record