CVE-2005-3774

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

18.2% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2005-11-23 00:03 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 18.2% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2005-11-23 00:03 UTC

Last modified

2026-06-16 22:17 UTC

Exploit probability

18.2% · EPSS, next 30 days

Record status

Modified

Affected

• Cisco Pix 6.3
• Cisco Pix 7.0

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2005-3774.md and follow it. Check whether this project is affected by CVE-2005-3774. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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