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CVE-2005-3774

Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new...

5.0 MediumPublic exploit

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.

Exploit likelihood

18.2%Up 5.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.0

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.

Record
CVE-2005-3774
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2005-3774
Updated
2026-11-02
EUVDEUVD-2005-3769 No score

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.

Record
EUVD-2005-3769
Updated
2026-11-03
GitHub AdvisoriesGHSA-46r6-jr5x-j746 No score

Cisco PIX 6.3 and 7.0 allows remote attackers to cause a denial of service (blocked new...

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.

Record
GHSA-46r6-jr5x-j746
Updated
2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBCisco PIX - Spoofed TCP SYN Packets Remote Denial of Service2005-11-23
Exploit-DBCisco PIX - TCP SYN Packet Denial of Service2005-11-22

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2005-3774 is a medium vulnerability (CVSS 5.0) in Cisco Pix, published November 23, 2005. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 18.2%, the 97th percentile. No source names a fixed version.

References

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