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
Published Nov 23, 2005
5.0
MEDIUMCVSS 2.0
EPSS 18.21%
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 18.21% (0.18207) | 97.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 18.21% (0.18207) | 96.84th | v5 (v2026.06.15) |
| Apr 5, 2025 | 35.14% (0.35143) | 96.71th | v4 (v2025.03.14) |
| Mar 30, 2025 | 29.09% (0.29085) | 96.17th | v4 (v2025.03.14) |
| Mar 29, 2025 | 35.37% (0.35367) | 95.45th | v4 (v2025.03.14) |
| Mar 23, 2025 | 29.09% (0.29085) | 96.01th | v4 (v2025.03.14) |
| Mar 17, 2025 | 23.29% (0.23293) | 95.49th | v4 (v2025.03.14) |
| Dec 17, 2024 | 62.35% (0.62352) | 97.97th | v3 (v2023.03.01) |
| Oct 30, 2024 | 33.93% (0.33929) | 97.17th | v3 (v2023.03.01) |
| Mar 14, 2024 | 40.23% (0.40233) | 97.16th | v3 (v2023.03.01) |
| Oct 13, 2023 | 43.12% (0.43116) | 96.91th | v3 (v2023.03.01) |
| Jun 4, 2023 | 39.83% (0.39829) | 96.71th | v3 (v2023.03.01) |
| Mar 7, 2023 | 34.47% (0.34468) | 96.38th | v3 (v2023.03.01) |
| Mar 6, 2023 | 12.57% (0.12567) | 95.52th | v2 (v2022.01.01) |
| Apr 1, 2022 | 12.57% (0.12567) | 95.18th | v2 (v2022.01.01) |
| Feb 4, 2022 | 12.57% (0.12567) | 90.03th | v2 (v2022.01.01) |
No CWE recorded.
References (16)
- http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038971.html mailing-listx_refsource_FULLDISCVendor Advisory
- http://lists.grok.org.uk/pipermail/full-disclosure/2005-November/038983.html mailing-listx_refsource_FULLDISC
- http://secunia.com/advisories/17670 third-party-advisoryx_refsource_SECUNIA
- http://securitytracker.com/id?1015256 vdb-entryx_refsource_SECTRACK
- http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_security_notice09186a0080624a37.html x_refsource_CONFIRM
- http://www.cisco.com/warp/public/707/cisco-response-20051122-pix.shtml vendor-advisoryx_refsource_CISCO
- http://www.kb.cert.org/vuls/id/853540 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.osvdb.org/24140 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/archive/1/417458/30/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/426989/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/426991/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/427041/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/15525 vdb-entryx_refsource_BID
- http://www.vupen.com/english/advisories/2005/2546 vdb-entryx_refsource_VUPEN
- https://exchange.xforce.ibmcloud.com/vulnerabilities/25077 vdb-entryx_refsource_XF
- https://exchange.xforce.ibmcloud.com/vulnerabilities/25079 vdb-entryx_refsource_XF
Change history (0)
No recorded changes yet.