MEDIUM
Cisco CatOS 5.x before 5.5(20) through 8.x before 8.2(2) and 8.3(2)GLX, as used in Catalyst switches, allows remote attackers to cause a denial of service (system crash and reload) by sending invalid packets instead of the final ACK portion of the three-way handshake to the (1) Telnet, (2) HTTP, or (3) SSH services, aka "TCP-ACK DoS attack."
Published Jun 15, 2004
5.0
MEDIUMCVSS 2.0
EPSS 3.13%
Description
Cisco CatOS 5.x before 5.5(20) through 8.x before 8.2(2) and 8.3(2)GLX, as used in Catalyst switches, allows remote attackers to cause a denial of service (system crash and reload) by sending invalid packets instead of the final ACK portion of the three-way handshake to the (1) Telnet, (2) HTTP, or (3) SSH services, aka "TCP-ACK DoS attack."
Affected products
No data.
Configuration 1
OR
- 2.1\(1\)
- 2.1\(2\)
- 2.1\(3\)
- 2.1\(4\)
- 2.1\(5\)
- 2.1\(6\)
- 2.1\(7\)
- 2.1\(8\)
- 2.1\(9\)
- 2.1\(10\)
- 2.1\(11\)
- 2.1\(12\)
- 2.2\(1\)
- 2.2\(2\)
- 2.3\(1\)
- 2.4\(1\)
- 2.4\(2\)
- 2.4\(3\)
- 2.4\(4\)
- 2.4\(5\)
- 2.4\(5a\)
- 3.0\(7\)
- 3.1\(1\)
- 3.1\(2\)
- 3.1\(2a\)
- 3.2\(1\)
- 3.2\(1b\)
- 3.2\(2\)
- 3.2\(3\)
- 3.2\(4\)
- 3.2\(5\)
- 3.2\(6\)
- 3.2\(7\)
- 3.2\(8\)gdr
- 4.1\(1\)
- 4.1\(2\)
- 4.1\(3\)
- 4.2\(1\)
- 4.2\(2\)
- 4.3\(1a\)
- 4.4\(1\)
- 4.5\(1\)
- 4.5\(2\)
- 4.5\(3\)
- 4.5\(4\)
- 4.5\(5\)
- 4.5\(6\)
- 4.5\(6a\)
- 4.5\(7\)
- 4.5\(8\)
- 4.5\(9\)
- 4.5\(10\)
- 4.5\(11\)
- 4.5\(12\)
- 4.5\(12a\)
- 4.5\(13\)
- 4.5\(13a\)
- 4.5\(14\)
- 5.1\(1\)
- 5.1\(1\)csx
- 5.1\(1a\)
- 5.1\(1a\)csx
- 5.1\(2a\)
- 5.1\(2b\)
- 5.2\(1\)
- 5.2\(1\)csx
- 5.2\(2\)
- 5.2\(2\)csx
- 5.2\(3\)
- 5.2\(3\)csx
- 5.2\(3a\)csx
- 5.2\(4\)
- 5.2\(5\)
- 5.2\(6\)
- 5.2\(7\)
- 5.2\(7a\)
- 5.3\(1a\)csx
- 5.3\(2\)csx
- 5.3\(3\)csx
- 5.3\(4\)csx
- 5.3\(5\)csx
- 5.3\(5a\)csx
- 5.3\(6\)csx
- 5.3\(6a\)csx
- 5.4
- 5.4\(1\)
- 5.4\(1\)deferred
- 5.4\(2\)
- 5.4\(2a\)
- 5.4\(3\)
- 5.4\(4\)
- 5.4\(4a\)
- 5.5
- 5.5\(1\)
- 5.5\(1a\)
- 5.5\(2\)
- 5.5\(3\)
- 5.5\(4\)
- 5.5\(4a\)
- 5.5\(4b\)
- 5.5\(5\)
- 5.5\(6\)
- 5.5\(6a\)
- 5.5\(7\)
- 5.5\(7a\)
- 5.5\(8\)
- 5.5\(8a\)
- 5.5\(8a\)cv
- 5.5\(9\)
- 5.5\(10\)
- 5.5\(10a\)
- 5.5\(11\)
- 5.5\(11a\)
- 5.5\(12\)
- 5.5\(12a\)
- 5.5\(13\)
- 5.5\(13.5\)
- 5.5\(13a\)
- 5.5\(14\)
- 5.5\(15\)
- 5.5\(16\)
- 5.5\(16.2\)
- 5.5\(17\)
- 5.5\(18\)
- 5.5\(19\)
- 6.1
- 6.1\(1\)
- 6.1\(1a\)
- 6.1\(1b\)
- 6.1\(1c\)
- 6.1\(1d\)
- 6.1\(1e\)
- 6.1\(2\)
- 6.1\(2a\)
- 6.1\(3\)
- 6.1\(3a\)
- 6.1\(4\)
- 6.1\(4b\)
- 6.2\(1\)
- 6.2\(1a\)
- 6.2\(2\)
- 6.2\(2a\)
- 6.2\(3\)
- 6.2\(3a\)
- 6.3\(1\)
- 6.3\(1a\)
- 6.3\(2\)
- 6.3\(2a\)
- 6.3\(3\)
- 6.3\(3\)x
- 6.3\(3\)x1
- 6.3\(3a\)
- 6.3\(4\)
- 6.3\(4a\)
- 6.3\(5\)
- 6.3\(5.10\)
- 6.3\(6\)
- 6.3\(7\)
- 6.3\(8\)
- 6.3\(8.3\)
- 6.3\(9\)
- 6.3\(10\)
- 6.4\(1\)
- 6.4\(2\)
- 6.4\(3\)
- 6.4\(4a\)
- 6.4\(5\)
- 6.4\(6\)
- 6.4\(7\)
- 6.4\(8\)
- 7.1\(1\)
- 7.1\(1a\)
- 7.1\(2\)
- 7.1\(2a\)
- 7.2\(0.65\)
- 7.2\(1\)
- 7.2\(2\)
- 7.3
- 7.3\(1\)
- 7.3\(2\)
- 7.4
- 7.4\(0.2\)clr
- 7.4\(0.63\)
- 7.4\(1\)
- 7.4\(2\)
- 7.4\(3\)
- 7.5
- 7.5\(1\)
- 7.6
- 7.6\(1\)
- 7.6\(2\)
- 7.6\(3\)
- 7.6\(4\)
- 7.6\(5\)
- 8.1
- 8.1\(2\)
- 8.1\(3\)
- 8.2
- 8.2\(1\)
- 8.3\(1\)glx
- 8.3glx
Configuration 2
OR
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- 2.2\(1a\)
- 3.1\(1a\)
- 2.2\(1a\)
- 3.1\(1a\)
- 2.1\(2\)
- 3.1\(1a\)
- 4.5\(2\)
- 4.5\(3\)
- 4.5\(4\)
- 4.5\(4b\)
- 4.5\(5\)
- 4.5\(6\)
- 4.5\(7\)
- 4.5\(8\)
- 4.5\(9\)
- 4.5\(10\)
- 4.5\(11\)
- 4.5\(12\)
- 4.5\(13a\)
- 4.5.10
- 5.1
- 5.1\(1\)
- 5.1\(1a\)
- 5.1\(2a\)
- 5.2
- 5.2\(1\)
- 5.2\(1a\)
- 5.2\(2\)
- 5.2\(3\)
- 5.2\(4\)
- 5.2\(5\)
- 5.2\(6\)
- 5.2\(7\)
- 5.3\(1\)csx
- 5.3\(1a\)csx
- 5.3\(2\)csx
- 5.3\(3\)csx
- 5.3\(4\)csx
- 5.3\(5\)csx
- 5.3\(5a\)csx
- 5.3\(6\)csx
- 5.4
- 5.4\(1\)
- 5.4\(2\)
- 5.4\(3\)
- 5.4\(4\)
- 5.5
- 5.5\(1\)
- 5.5\(2\)
- 5.5\(3\)
- 5.5\(4\)
- 5.5\(4a\)
- 5.5\(4b\)
- 5.5\(5\)
- 5.5\(6\)
- 5.5\(7\)
- 5.5\(13\)
- 6.1\(1\)
- 6.1\(1a\)
- 6.1\(1b\)
- 6.1\(1c\)
- 6.1\(2\)
- 6.1\(2.13\)
- 6.1\(3\)
- 6.2\(0.110\)
- 6.2\(0.111\)
- 6.3\(0.7\)pan
- 6.3\(4\)
- 6.3\(5\)
- 7.1
- 7.1\(2\)
- 7.5\(1\)
- 7.6\(1\)
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
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.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.13% 0.03131
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.03131
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.13% (0.03131) | 87.42th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.13% (0.03131) | 86.15th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.80% (0.00795) | 72.30th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.88% (0.00875) | 83.15th | v3 (v2023.03.01) |
| Apr 4, 2024 | 0.88% (0.00875) | 82.13th | v3 (v2023.03.01) |
| May 23, 2023 | 0.88% (0.00875) | 80.12th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.95% (0.00945) | 80.74th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.14% (0.01136) | 59.45th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.14% (0.01136) | 58.28th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.14% (0.01136) | 56.27th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.14% (0.01136) | 34.23th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (3)
- http://www.cisco.com/warp/public/707/cisco-sa-20040609-catos.shtml vendor-advisoryx_refsource_CISCO
- http://www.kb.cert.org/vuls/id/245190 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- https://exchange.xforce.ibmcloud.com/vulnerabilities/16370 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://www.cisco.com/warp/public/707/cisco-sa-20040609-catos.shtml | vendor-advisoryx_refsource_CISCO | |
| http://www.kb.cert.org/vuls/id/245190 | third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/16370 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jun 15, 2004
Updated Aug 8, 2024
Reserved Jun 11, 2004
Link CVE-2004-0551
CISA Vulnrichment
Updated n/a