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Fencer Intel
high 7.5

CVE-2018-18541 json

In Teeworlds before 0.6.5, connection packets could be forged.

published 2018-10-20 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10263

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

In Teeworlds before 0.6.5, connection packets could be forged. There was no challenge-response involved in the connection build up. A remote attacker could send connection packets from a spoofed IP address and occupy all server slots, or even use them for a reflection attack using map download packets.

Patch / fix

  • teeworlds teeworlds 0.6.5
  • teeworlds Debian 14, Debian 13, Debian 12 0.7.0-1

debian advisories DEBIAN-CVE-2018-18541

  • teeworlds Package Hub 15 SP1 0.7.3.1-bp151.2.3.3
  • teeworlds openSUSE Leap 15.1 0.7.3.1-lp151.2.3.1

opensuse advisories openSUSE-SU-2019:1999-1openSUSE-SU-2019:1793-1

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-2018-18541 updated cvss 7.5

teeworlds: Missing challenge-response in the connection build up

  • 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

2.94% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

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.