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Vulnerability record · CVE-2020-24371 · published 17 August 2020

CVE-2020-24371: Lua vulnerability

Lua · Lua

lgc.c in Lua 5.4.0 mishandles the interaction between barriers and the sweep phase, leading to a memory access violation involving collectgarbage.

5.3 CVSS 3.1 Medium EPSS 1.7% · top 23.1% CWE-763 · CWE-763
5.3CVSS 3.1 base score, v2 5.0
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

lgc.c in Lua 5.4.0 mishandles the interaction between barriers and the sweep phase, leading to a memory access violation involving collectgarbage.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/lua/lua/commit/a6da1472c0c5e05ff249325f979531ad51533110 PatchThird Party Advisory
https://www.lua.org/bugs.html#5.4.0-10 ExploitPatchRelease NotesVendor Advisory
https://github.com/lua/lua/commit/a6da1472c0c5e05ff249325f979531ad51533110 PatchThird Party Advisory
https://www.lua.org/bugs.html#5.4.0-10 ExploitPatchRelease NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-15889Lua out-of-bounds read vulnerabilityLua 5.4.0 has a getobjname heap-based buffer over-read because youngcollection in lgc.c uses markold for an insufficient number of list members.EPSS 2.2%9.1CVE-2022-28805Lua out-of-bounds read vulnerabilitysinglevar in lparser.c in Lua from (including) 5.4.0 up to (excluding) 5.4.4 lacks a certain luaK_exp2anyregup call, leading to a heap-based buffer o…EPSS 3.0%8.8CVE-2020-15888Lua out-of-bounds read vulnerabilityLua through 5.4.0 mishandles the interaction between stack resizes and garbage collection, leading to a heap-based buffer overflow, heap-based buffer…EPSS 2.4%7.8CVE-2020-24342Lua memory buffer overflow vulnerabilityLua through 5.4.0 allows a stack redzone cross in luaO_pushvfstring because a protection mechanism wrongly calls luaD_callnoyield twice in a row.EPSS 1.1%7.5CVE-2021-45985Lua out-of-bounds write vulnerabilityIn Lua 5.4.3, an erroneous finalizer called during a tail call leads to a heap-based buffer over-read.EPSS 1.4%7.5CVE-2022-33099Lua out-of-bounds write vulnerabilityAn issue in the component luaG_runerror of Lua v5.4.4 and below leads to a heap-buffer overflow when a recursive error occurs.EPSS 2.8%7.5CVE-2020-24369Lua null pointer dereference vulnerabilityldebug.c in Lua 5.4.0 attempts to access debug information via the line hook of a stripped function, leading to a NULL pointer dereference.EPSS 1.7%7.5CVE-2019-6706Lua use after free vulnerabilityLua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a d…EPSS 17%

Source: NIST National Vulnerability Database (record CVE-2020-24371), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.