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Fencer Intel
medium 5.5

CVE-2020-15945 json

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…

published 6y ago modified 2mo ago also BIT-lua-2020-15945 , EUVD-2020-7916 , JLSEC-2026-554

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami lua 5.4.0
  • julia Lua_jll 5.4.3+0
  • lua lua 5.4.0
  • lua5.4 Debian 14, Debian 13, Debian 12 5.4.1-1

debian advisories DEBIAN-CVE-2020-15945

  • lua55 openSUSE Tumbleweed 5.5.0~beta1-1.1

opensuse advisories openSUSE-SU-2025:15401-1

  • lua Azure Linux 3.0 5.4.0-1
  • lua CBL-Mariner 2.0 5.4.3-1

azure linux advisories AZL-40818AZL-6671

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2020-15945 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15945 updated cvss 5.5

lua: segmentation fault in changedline in ldebug.c

  • Red Hat Ceph Storage 3 ceph, librbd1, librgw2, ceph-mds, ceph-mgr, ceph-mon, +15 more
    affected: no fix planned “Will not fix”
  • Red Hat Ceph Storage 4 ceph, librbd1, librgw2, rbd-nbd, ceph-mds, ceph-mgr, +27 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 6 lua Red Hat Enterprise Linux 7 lua Red Hat Enterprise Linux 8 lua, lua-libs Red Hat Enterprise Linux 9 lua, lua-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • lua-users.org http://lua-users.org/lists/lua-l/2020-07/msg00123.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami lua
>=5.3.1, <5.4.0
5.4.0
julia Lua_jll
<5.4.3+0
5.4.3+0

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.