HOMEVULNERABILITIESCVE-2021-43518
HIGH

CVE-2021-43518

CWE-120Published: December 15, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

Teeworlds up to and including 0.7.5 is vulnerable to Buffer Overflow. A map parser does not validate m_Channels value coming from a map file, leading to a buffer overflow. A malicious server may offer a specially crafted map that will overwrite client's stack causing denial of service or code execution.

NVD Source

Technical Analysis

CVE-2021-43518 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.

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
teeworlds1 product(s)
teeworlds
Source: NVD CPE · 3 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

ADVISORYhttps://github.com/teeworlds/teeworlds/issues/2981
ADVISORYhttps://mmmds.pl/fuzzing-map-parser-part-1-teeworlds/
ADVISORYhttps://github.com/teeworlds/teeworlds/issues/2981
ADVISORYhttps://mmmds.pl/fuzzing-map-parser-part-1-teeworlds/

All References (8)

→
https://github.com/teeworlds/teeworlds/issues/2981Exploit · Issue Tracking · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIYZ7EVY6NZBM7FQF6GVUARYO6MKSEAT/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OS2LI2RHQNUKUT3FKWYHRC27PLRWCHMZ/
→
https://mmmds.pl/fuzzing-map-parser-part-1-teeworlds/Exploit · Third Party Advisory
→
https://github.com/teeworlds/teeworlds/issues/2981Exploit · Issue Tracking · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIYZ7EVY6NZBM7FQF6GVUARYO6MKSEAT/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OS2LI2RHQNUKUT3FKWYHRC27PLRWCHMZ/
→
https://mmmds.pl/fuzzing-map-parser-part-1-teeworlds/Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-43518
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-120
CISA KEVNo
Affected2 vendor(s)
PublishedDec 15, 2021

Related CVEs (CWE-120)

CVE-2023-4260
10.0
CVE-2001-0191
10.0
CVE-2007-1770
10.0
CVE-1999-1237
10.0
CVE-1999-0385
10.0
CVE-2017-16740
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43518 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. CVE data is provided under the NVD usage policy.
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