HOMEVULNERABILITIESCVE-2020-24342
HIGH

CVE-2020-24342

CWE-119Published: August 13, 2020· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

Lua through 5.4.0 allows a stack redzone cross in luaO_pushvfstring because a protection mechanism wrongly calls luaD_callnoyield twice in a row.

NVD Source

Technical Analysis

CVE-2020-24342 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
lua1 product(s)
lua
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27
PATCHhttps://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27
ADVISORYhttp://lua-users.org/lists/lua-l/2020-07/msg00052.html
ADVISORYhttp://lua-users.org/lists/lua-l/2020-07/msg00052.html

All References (6)

→
http://lua-users.org/lists/lua-l/2020-07/msg00052.htmlExploit · Mailing List · Vendor Advisory
→
https://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QA5Q5MDQMTGXRQO3PAQ4EZFTYWJXZM5N/
→
http://lua-users.org/lists/lua-l/2020-07/msg00052.htmlExploit · Mailing List · Vendor Advisory
→
https://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QA5Q5MDQMTGXRQO3PAQ4EZFTYWJXZM5N/

Quick Facts

CVE IDCVE-2020-24342
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-119
CISA KEVNo
Affected2 vendor(s)
PublishedAug 13, 2020

Related CVEs (CWE-119)

CVE-2012-0243
10.0
CVE-2011-0264
10.0
CVE-2011-0262
10.0
CVE-2011-0265
10.0
CVE-2011-0263
10.0
CVE-1999-0876
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-24342 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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