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CVE-2005-3774

MediumPublished

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...

Published: Nov 23, 2005
Updated: Aug 7, 2024
Assigning CNA: mitre
Evidence observed: Nov 22, 2005

Primary CVSS

5.0/ 10Medium

nvd · CVSS 2.0

AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS probability estimate

18.2%

Moderate · next 30 days

Percentile: 97.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

Cisco PIX - Spoofed TCP SYN Packets Remote Denial of ServiceExploit
Janis Vizulis · hardware · Nov 23, 2005
Cisco PIX - TCP SYN Packet Denial of ServiceExploit
Janis Vizulis · hardware · Nov 22, 2005

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