CVE-2005-3774
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…
- 5.0MediumCVSS base score
- 18.2%Exploitation in 30 daysEPSS · top 2.8% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 2Public exploitsMetasploit, Nuclei and Exploit-DB
Description
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list 2 Exploit-DB entries for it.
Show the exploits2
Exploit-DB2 entries
- Cisco PIX - Spoofed TCP SYN Packets Remote Denial of Service (Exploit-DB entry) (opens in a new tab)
EDB-ID 1338dos, hardwarepublished 23 Nov 2005Verified
- Cisco PIX - TCP SYN Packet Denial of Service (Exploit-DB entry) (opens in a new tab)
EDB-ID 26548dos, hardwarepublished 22 Nov 2005Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 1 day later
· 1 day later
Published
- 19 years later
· 19 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
- EPSS (exploitation in 30 days)
- 18.2% · top 2.8% of all CVEs (9 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Affected products
n/a
- affected n/a
References
16
- 1015256 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- cisco-pix-ttl-dos(25079) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- cisco-pix-tcp-data-field-dos(25077) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 24140 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- 15525 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_security_notice09186a0080624a37.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20051122 Cisco PIX TCP Connection Prevention (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 20060307 Cisco PIX embryonic state machine 1b data DoS (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20051128 Response to Cisco PIX TCP Connection Prevention (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- 20060307 Cisco PIX embryonic state machine TTL(n-1) DoS (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- VU#853540 (opens in a new tab)third-party-advisoryx_refsource_CERT-VNx_transferred
- 17670 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 20060307 RE: Cisco PIX embryonic state machine 1b data DoS (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- ADV-2005-2546 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 20051122 Cisco PIX TCP Connection Prevention (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20051122 Cisco PIX TCP Connection Prevention (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2005-3769 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2005-3774)Record last updated .