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Fencer Vulns
medium 5.0

CVE-2005-3774 json

Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the…

published 2005-11-23 20 y ago modified 2026-06-16 4 mo ago also EUVD-2005-3769

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
18.2%
EPSS 18.2% chance of exploitation in 30 days, percentile 97%
public exploits
2
Exploit-DB

Summary

Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new connections) via spoofed TCP packets that cause the PIX to create embryonic connections that that would not produce a valid connection with the end system, including (1) SYN packets with invalid checksums, which do not result in a RST; or, from an external interface, (2) one byte of "meaningless data," or (3) a TTL that is one less than needed to reach the internal destination.

Timeline

  1. First public exploit (EDB-26548)
  2. Published

Exploit prediction

18.21% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-26548 Cisco PIX - TCP SYN Packet Denial of Service dos, 2005-11-22
  • EDB-1338 Cisco PIX - Spoofed TCP SYN Packets Remote Denial of Service dos, 2005-11-23

CVSS scores

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

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.