CVE-2020-24372: LuaJIT through 2.1.0-beta3 has an out-of-bounds read in lj_err_run in lj_err.c.

Q: How do I fix CVE-2020-24372?

luajit: upgrade to newer than 2.0.5. Exact commands for each OS are on this page.

Q: Is CVE-2020-24372 being exploited?

CVE-2020-24372 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-24372 affect?

CVE-2020-24372 affects luajit. Severity is high (CVSS 7.5). LuaJIT through 2.1.0-beta3 has an out-of-bounds read in lj_err_run in lj_err.c.

Q: How urgent is CVE-2020-24372?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2020-24372 is a high-severity flaw (CVSS 7.5) affecting luajit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LuaJIT through 2.1.0-beta3 has an out-of-bounds read in lj_err_run in lj_err.c.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-125
Published	2020-08-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: luajit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-08-17 17:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

luajit luajit UPGRADE

Affected: <= 2.0.5 · 2.1.0 beta1 · 2.1.0 beta2 · 2.1.0 beta3

Fixed in: newer than 2.0.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy luajit || rpm -q luajit || luajit --version

2. UPGRADE to newer than 2.0.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade luajit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade luajit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-24372?

luajit: upgrade to newer than 2.0.5. Exact commands for each OS are on this page.

Is CVE-2020-24372 being exploited?

CVE-2020-24372 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-24372 affect?

CVE-2020-24372 affects luajit. Severity is high (CVSS 7.5). LuaJIT through 2.1.0-beta3 has an out-of-bounds read in lj_err_run in lj_err.c.

How urgent is CVE-2020-24372?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2024-25176 CRITICAL 9.8 UPGRADE LuaJIT through 2.1 and OpenRusty luajit2 before v2.1-20240626 have a stack-buffer-overflow in lj_strfmt_wfnum
CVE-2020-15890 HIGH 7.5 UPGRADE MITIGATE LuaJit through 2.1.0-beta3 has an out-of-bounds read because __gc handler frame traversal is mishandled.
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References

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