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Fencer Vulns
high 7.8

CVE-2021-43518 json

Teeworlds up to and including 0.7.5 is vulnerable to Buffer Overflow.

published 2021-12-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30447

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

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.

Patch / fix

  • teeworlds Debian 14, Debian 13, Debian 12 0.7.5-2

debian advisories DEBIAN-CVE-2021-43518

  • teeworlds Ubuntu 26.04 LTS, Ubuntu 25.10, Ubuntu 24.04 LTS 0.7.5-2

ubuntu advisories UBUNTU-CVE-2021-43518

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2021-43518 updated cvss 6.4

teeworlds: code execution via malicious map file

  • Red Hat All currently supported Red Hat products
    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

1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/teeworlds/teeworlds/issues/2981 referenced PoC, tagged "exploit" by a source, unverified
  • mmmds.pl https://mmmds.pl/fuzzing-map-parser-part-1-teeworlds/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Vulns 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.