CVE-2020-15945

Name: CVE-2020-15945
Creator: NVD / NIST
Published: 2020-07-24T21:15:34.553+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2020-15945 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.53%

40.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Lua	Lua	>= 5.3.1, < 5.4.0

References

http://lua-users.org/lists/lua-l/2020-07/msg00123.htmlExploit, Mailing List, Third Party Advisory
https://github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3Patch, Third Party Advisory
https://www.lua.org/bugs.html#5.4.0-8
http://lua-users.org/lists/lua-l/2020-07/msg00123.htmlExploit, Mailing List, Third Party Advisory
https://github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3Patch, Third Party Advisory

Timeline

Published: Jul 24, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15945?

How severe is CVE-2020-15945?

CVE-2020-15945 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15945?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15945?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST