Description
Buffer overflow in socket/request.c in CrossFire before 1.9.0, when oldsocketmode is enabled, allows remote attackers to cause a denial of service (segmentation fault) and possibly execute code by sending the server a large request.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | crossfire | 1.9.0-1 | — |
| Debian 13 | crossfire | 1.9.0-1 | — |
| Debian 12 | crossfire | 1.9.0-1 | — |
| Debian 3.1 | crossfire | 1.6.0.dfsg.1-4sarge1 | DSA-1001-1 |
| Debian 3.0 | crossfire | 1.1.0-1woody1 | DSA-1001-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- CrossFire 1.8.0 - 'oldsocketmode' Remote Buffer Overflow (PoC) EDB-1535 · dos · Feb 27, 2006 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DSA-1001-1 crossfire - buffer overflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- 19785 third-party-advisory
- http://cvs.sourceforge.net/viewcvs.py/crossfire/crossfire/socket/request.c?r1=1.80&r2=1.81
- DSA-1001 vendor-advisory
- ADV-2006-0760 vdb-entry
- 16883 vdb-entry
- 19044 third-party-advisory
- http://aluigi.altervista.org/poc/crossfirebof.zip
- crossfire-oldsocketmode-bo(24932) vdb-entry
- GLSA-200604-11 vendor-advisory
- 23549 vdb-entry
- 19194 third-party-advisory