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Fencer Vulns
medium 5.0

CVE-2005-2540 json

CRLF injection vulnerability in FlatNuke 2.5.5 and possibly earlier versions allows remote attackers to execute arbitrary PHP commands via…

published 2005-08-10 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-2541

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.1%
EPSS 6.1% chance of exploitation in 30 days, percentile 93%
public exploits
1
Exploit-DB

Summary

CRLF injection vulnerability in FlatNuke 2.5.5 and possibly earlier versions allows remote attackers to execute arbitrary PHP commands via an ASCII char 13 (carriage return) in the signature field, which is injected into a PHP script without a preceding comment character, which can then be executed by a direct request.

Timeline

  1. First public exploit (EDB-1140)
  2. Published

Exploit prediction

6.10% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-1140 Flatnuke 2.5.5 - Remote Code Execution webapps, 2005-08-08
  • rgod.altervista.org http://www.rgod.altervista.org/flatnuke.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

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.