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."
2004-08-06T04:00:00.000
2025-04-03T01:03:51.193
Deferred
CVSSv2: 5.0 (MEDIUM)
AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Operating System | cisco | catos | 2.1\(1\) | Yes |
| Operating System | cisco | catos | 2.1\(2\) | Yes |
| Operating System | cisco | catos | 2.1\(3\) | Yes |
| Operating System | cisco | catos | 2.1\(4\) | Yes |
| Operating System | cisco | catos | 2.1\(5\) | Yes |
| Operating System | cisco | catos | 2.1\(6\) | Yes |
| Operating System | cisco | catos | 2.1\(7\) | Yes |
| Operating System | cisco | catos | 2.1\(8\) | Yes |
| Operating System | cisco | catos | 2.1\(9\) | Yes |
| Operating System | cisco | catos | 2.1\(10\) | Yes |
| Operating System | cisco | catos | 2.1\(11\) | Yes |
| Operating System | cisco | catos | 2.1\(12\) | Yes |
| Operating System | cisco | catos | 2.2\(1\) | Yes |
| Operating System | cisco | catos | 2.2\(2\) | Yes |
| Operating System | cisco | catos | 2.3\(1\) | Yes |
| Operating System | cisco | catos | 2.4\(1\) | Yes |
| Operating System | cisco | catos | 2.4\(2\) | Yes |
| Operating System | cisco | catos | 2.4\(3\) | Yes |
| Operating System | cisco | catos | 2.4\(4\) | Yes |
| Operating System | cisco | catos | 2.4\(5\) | Yes |
| Operating System | cisco | catos | 2.4\(5a\) | Yes |
| Operating System | cisco | catos | 3.0\(7\) | Yes |
| Operating System | cisco | catos | 3.1\(1\) | Yes |
| Operating System | cisco | catos | 3.1\(2\) | Yes |
| Operating System | cisco | catos | 3.1\(2a\) | Yes |
| Operating System | cisco | catos | 3.2\(1\) | Yes |
| Operating System | cisco | catos | 3.2\(1b\) | Yes |
| Operating System | cisco | catos | 3.2\(2\) | Yes |
| Operating System | cisco | catos | 3.2\(3\) | Yes |
| Operating System | cisco | catos | 3.2\(4\) | Yes |
| Operating System | cisco | catos | 3.2\(5\) | Yes |
| Operating System | cisco | catos | 3.2\(6\) | Yes |
| Operating System | cisco | catos | 3.2\(7\) | Yes |
| Operating System | cisco | catos | 3.2\(8\)gdr | Yes |
| Operating System | cisco | catos | 4.1\(1\) | Yes |
| Operating System | cisco | catos | 4.1\(2\) | Yes |
| Operating System | cisco | catos | 4.1\(3\) | Yes |
| Operating System | cisco | catos | 4.2\(1\) | Yes |
| Operating System | cisco | catos | 4.2\(2\) | Yes |
| Operating System | cisco | catos | 4.3\(1a\) | Yes |
| Operating System | cisco | catos | 4.4\(1\) | Yes |
| Operating System | cisco | catos | 4.5\(1\) | Yes |
| Operating System | cisco | catos | 4.5\(2\) | Yes |
| Operating System | cisco | catos | 4.5\(3\) | Yes |
| Operating System | cisco | catos | 4.5\(4\) | Yes |
| Operating System | cisco | catos | 4.5\(5\) | Yes |
| Operating System | cisco | catos | 4.5\(6\) | Yes |
| Operating System | cisco | catos | 4.5\(6a\) | Yes |
| Operating System | cisco | catos | 4.5\(7\) | Yes |
| Operating System | cisco | catos | 4.5\(8\) | Yes |
| Operating System | cisco | catos | 4.5\(9\) | Yes |
| Operating System | cisco | catos | 4.5\(10\) | Yes |
| Operating System | cisco | catos | 4.5\(11\) | Yes |
| Operating System | cisco | catos | 4.5\(12\) | Yes |
| Operating System | cisco | catos | 4.5\(12a\) | Yes |
| Operating System | cisco | catos | 4.5\(13\) | Yes |
| Operating System | cisco | catos | 4.5\(13a\) | Yes |
| Operating System | cisco | catos | 4.5\(14\) | Yes |
| Operating System | cisco | catos | 5.1\(1\) | Yes |
| Operating System | cisco | catos | 5.1\(1\)csx | Yes |
| Operating System | cisco | catos | 5.1\(1a\) | Yes |
| Operating System | cisco | catos | 5.1\(1a\)csx | Yes |
| Operating System | cisco | catos | 5.1\(2a\) | Yes |
| Operating System | cisco | catos | 5.1\(2b\) | Yes |
| Operating System | cisco | catos | 5.2\(1\) | Yes |
| Operating System | cisco | catos | 5.2\(1\)csx | Yes |
| Operating System | cisco | catos | 5.2\(2\) | Yes |
| Operating System | cisco | catos | 5.2\(2\)csx | Yes |
| Operating System | cisco | catos | 5.2\(3\) | Yes |
| Operating System | cisco | catos | 5.2\(3\)csx | Yes |
| Operating System | cisco | catos | 5.2\(3a\)csx | Yes |
| Operating System | cisco | catos | 5.2\(4\) | Yes |
| Operating System | cisco | catos | 5.2\(5\) | Yes |
| Operating System | cisco | catos | 5.2\(6\) | Yes |
| Operating System | cisco | catos | 5.2\(7\) | Yes |
| Operating System | cisco | catos | 5.2\(7a\) | Yes |
| Operating System | cisco | catos | 5.3\(1a\)csx | Yes |
| Operating System | cisco | catos | 5.3\(2\)csx | Yes |
| Operating System | cisco | catos | 5.3\(3\)csx | Yes |
| Operating System | cisco | catos | 5.3\(4\)csx | Yes |
| Operating System | cisco | catos | 5.3\(5\)csx | Yes |
| Operating System | cisco | catos | 5.3\(5a\)csx | Yes |
| Operating System | cisco | catos | 5.3\(6\)csx | Yes |
| Operating System | cisco | catos | 5.3\(6a\)csx | Yes |
| Operating System | cisco | catos | 5.4 | Yes |
| Operating System | cisco | catos | 5.4\(1\) | Yes |
| Operating System | cisco | catos | 5.4\(1\)deferred | Yes |
| Operating System | cisco | catos | 5.4\(2\) | Yes |
| Operating System | cisco | catos | 5.4\(2a\) | Yes |
| Operating System | cisco | catos | 5.4\(3\) | Yes |
| Operating System | cisco | catos | 5.4\(4\) | Yes |
| Operating System | cisco | catos | 5.4\(4a\) | Yes |
| Operating System | cisco | catos | 5.5 | Yes |
| Operating System | cisco | catos | 5.5\(1\) | Yes |
| Operating System | cisco | catos | 5.5\(1a\) | Yes |
| Operating System | cisco | catos | 5.5\(2\) | Yes |
| Operating System | cisco | catos | 5.5\(3\) | Yes |
| Operating System | cisco | catos | 5.5\(4\) | Yes |
| Operating System | cisco | catos | 5.5\(4a\) | Yes |
| Operating System | cisco | catos | 5.5\(4b\) | Yes |
| Operating System | cisco | catos | 5.5\(5\) | Yes |
| Operating System | cisco | catos | 5.5\(6\) | Yes |
| Operating System | cisco | catos | 5.5\(6a\) | Yes |
| Operating System | cisco | catos | 5.5\(7\) | Yes |
| Operating System | cisco | catos | 5.5\(7a\) | Yes |
| Operating System | cisco | catos | 5.5\(8\) | Yes |
| Operating System | cisco | catos | 5.5\(8a\) | Yes |
| Operating System | cisco | catos | 5.5\(8a\)cv | Yes |
| Operating System | cisco | catos | 5.5\(9\) | Yes |
| Operating System | cisco | catos | 5.5\(10\) | Yes |
| Operating System | cisco | catos | 5.5\(10a\) | Yes |
| Operating System | cisco | catos | 5.5\(11\) | Yes |
| Operating System | cisco | catos | 5.5\(11a\) | Yes |
| Operating System | cisco | catos | 5.5\(12\) | Yes |
| Operating System | cisco | catos | 5.5\(12a\) | Yes |
| Operating System | cisco | catos | 5.5\(13\) | Yes |
| Operating System | cisco | catos | 5.5\(13.5\) | Yes |
| Operating System | cisco | catos | 5.5\(13a\) | Yes |
| Operating System | cisco | catos | 5.5\(14\) | Yes |
| Operating System | cisco | catos | 5.5\(15\) | Yes |
| Operating System | cisco | catos | 5.5\(16\) | Yes |
| Operating System | cisco | catos | 5.5\(16.2\) | Yes |
| Operating System | cisco | catos | 5.5\(17\) | Yes |
| Operating System | cisco | catos | 5.5\(18\) | Yes |
| Operating System | cisco | catos | 5.5\(19\) | Yes |
| Operating System | cisco | catos | 6.1 | Yes |
| Operating System | cisco | catos | 6.1\(1\) | Yes |
| Operating System | cisco | catos | 6.1\(1a\) | Yes |
| Operating System | cisco | catos | 6.1\(1b\) | Yes |
| Operating System | cisco | catos | 6.1\(1c\) | Yes |
| Operating System | cisco | catos | 6.1\(1d\) | Yes |
| Operating System | cisco | catos | 6.1\(1e\) | Yes |
| Operating System | cisco | catos | 6.1\(2\) | Yes |
| Operating System | cisco | catos | 6.1\(2a\) | Yes |
| Operating System | cisco | catos | 6.1\(3\) | Yes |
| Operating System | cisco | catos | 6.1\(3a\) | Yes |
| Operating System | cisco | catos | 6.1\(4\) | Yes |
| Operating System | cisco | catos | 6.1\(4b\) | Yes |
| Operating System | cisco | catos | 6.2\(1\) | Yes |
| Operating System | cisco | catos | 6.2\(1a\) | Yes |
| Operating System | cisco | catos | 6.2\(2\) | Yes |
| Operating System | cisco | catos | 6.2\(2a\) | Yes |
| Operating System | cisco | catos | 6.2\(3\) | Yes |
| Operating System | cisco | catos | 6.2\(3a\) | Yes |
| Operating System | cisco | catos | 6.3\(1\) | Yes |
| Operating System | cisco | catos | 6.3\(1a\) | Yes |
| Operating System | cisco | catos | 6.3\(2\) | Yes |
| Operating System | cisco | catos | 6.3\(2a\) | Yes |
| Operating System | cisco | catos | 6.3\(3\) | Yes |
| Operating System | cisco | catos | 6.3\(3\)x | Yes |
| Operating System | cisco | catos | 6.3\(3\)x1 | Yes |
| Operating System | cisco | catos | 6.3\(3a\) | Yes |
| Operating System | cisco | catos | 6.3\(4\) | Yes |
| Operating System | cisco | catos | 6.3\(4a\) | Yes |
| Operating System | cisco | catos | 6.3\(5\) | Yes |
| Operating System | cisco | catos | 6.3\(5.10\) | Yes |
| Operating System | cisco | catos | 6.3\(6\) | Yes |
| Operating System | cisco | catos | 6.3\(7\) | Yes |
| Operating System | cisco | catos | 6.3\(8\) | Yes |
| Operating System | cisco | catos | 6.3\(8.3\) | Yes |
| Operating System | cisco | catos | 6.3\(9\) | Yes |
| Operating System | cisco | catos | 6.3\(10\) | Yes |
| Operating System | cisco | catos | 6.4\(1\) | Yes |
| Operating System | cisco | catos | 6.4\(2\) | Yes |
| Operating System | cisco | catos | 6.4\(3\) | Yes |
| Operating System | cisco | catos | 6.4\(4a\) | Yes |
| Operating System | cisco | catos | 6.4\(5\) | Yes |
| Operating System | cisco | catos | 6.4\(6\) | Yes |
| Operating System | cisco | catos | 6.4\(7\) | Yes |
| Operating System | cisco | catos | 6.4\(8\) | Yes |
| Operating System | cisco | catos | 7.1\(1\) | Yes |
| Operating System | cisco | catos | 7.1\(1a\) | Yes |
| Operating System | cisco | catos | 7.1\(2\) | Yes |
| Operating System | cisco | catos | 7.1\(2a\) | Yes |
| Operating System | cisco | catos | 7.2\(0.65\) | Yes |
| Operating System | cisco | catos | 7.2\(1\) | Yes |
| Operating System | cisco | catos | 7.2\(2\) | Yes |
| Operating System | cisco | catos | 7.3 | Yes |
| Operating System | cisco | catos | 7.3\(1\) | Yes |
| Operating System | cisco | catos | 7.3\(2\) | Yes |
| Operating System | cisco | catos | 7.4 | Yes |
| Operating System | cisco | catos | 7.4\(0.2\)clr | Yes |
| Operating System | cisco | catos | 7.4\(0.63\) | Yes |
| Operating System | cisco | catos | 7.4\(1\) | Yes |
| Operating System | cisco | catos | 7.4\(2\) | Yes |
| Operating System | cisco | catos | 7.4\(3\) | Yes |
| Operating System | cisco | catos | 7.5 | Yes |
| Operating System | cisco | catos | 7.5\(1\) | Yes |
| Operating System | cisco | catos | 7.6 | Yes |
| Operating System | cisco | catos | 7.6\(1\) | Yes |
| Operating System | cisco | catos | 7.6\(2\) | Yes |
| Operating System | cisco | catos | 7.6\(3\) | Yes |
| Operating System | cisco | catos | 7.6\(4\) | Yes |
| Operating System | cisco | catos | 7.6\(5\) | Yes |
| Operating System | cisco | catos | 8.1 | Yes |
| Operating System | cisco | catos | 8.1\(2\) | Yes |
| Operating System | cisco | catos | 8.1\(3\) | Yes |
| Operating System | cisco | catos | 8.2 | Yes |
| Operating System | cisco | catos | 8.2\(1\) | Yes |
| Operating System | cisco | catos | 8.3\(1\)glx | Yes |
| Operating System | cisco | catos | 8.3glx | Yes |
| Hardware | cisco | catalyst_2901 | * | Yes |
| Hardware | cisco | catalyst_2902 | * | Yes |
| Hardware | cisco | catalyst_2926 | * | Yes |
| Hardware | cisco | catalyst_2926f | * | Yes |
| Hardware | cisco | catalyst_2926gl | * | Yes |
| Hardware | cisco | catalyst_2926gs | * | Yes |
| Hardware | cisco | catalyst_2926t | * | Yes |
| Hardware | cisco | catalyst_2948 | * | Yes |
| Hardware | cisco | catalyst_2948-ge-tx | * | Yes |
| Hardware | cisco | catalyst_2948g-l3 | * | Yes |
| Hardware | cisco | catalyst_2980g | * | Yes |
| Hardware | cisco | catalyst_2980g-a | * | Yes |
| Hardware | cisco | catalyst_4000 | * | Yes |
| Hardware | cisco | catalyst_4500 | * | Yes |
| Hardware | cisco | catalyst_4503 | * | Yes |
| Hardware | cisco | catalyst_4506 | * | Yes |
| Hardware | cisco | catalyst_4507r | * | Yes |
| Hardware | cisco | catalyst_4510r | * | Yes |
| Hardware | cisco | catalyst_4912g | * | Yes |
| Hardware | cisco | catalyst_5000 | * | Yes |
| Hardware | cisco | catalyst_6000_ws-svc-nam-1 | 2.2\(1a\) | Yes |
| Hardware | cisco | catalyst_6000_ws-svc-nam-1 | 3.1\(1a\) | Yes |
| Hardware | cisco | catalyst_6000_ws-svc-nam-2 | 2.2\(1a\) | Yes |
| Hardware | cisco | catalyst_6000_ws-svc-nam-2 | 3.1\(1a\) | Yes |
| Hardware | cisco | catalyst_6000_ws-x6380-nam | 2.1\(2\) | Yes |
| Hardware | cisco | catalyst_6000_ws-x6380-nam | 3.1\(1a\) | Yes |
| Operating System | cisco | catos | 4.5\(2\) | Yes |
| Operating System | cisco | catos | 4.5\(3\) | Yes |
| Operating System | cisco | catos | 4.5\(4\) | Yes |
| Operating System | cisco | catos | 4.5\(4b\) | Yes |
| Operating System | cisco | catos | 4.5\(5\) | Yes |
| Operating System | cisco | catos | 4.5\(6\) | Yes |
| Operating System | cisco | catos | 4.5\(7\) | Yes |
| Operating System | cisco | catos | 4.5\(8\) | Yes |
| Operating System | cisco | catos | 4.5\(9\) | Yes |
| Operating System | cisco | catos | 4.5\(10\) | Yes |
| Operating System | cisco | catos | 4.5\(11\) | Yes |
| Operating System | cisco | catos | 4.5\(12\) | Yes |
| Operating System | cisco | catos | 4.5\(13a\) | Yes |
| Operating System | cisco | catos | 4.5.10 | Yes |
| Operating System | cisco | catos | 5.1 | Yes |
| Operating System | cisco | catos | 5.1\(1\) | Yes |
| Operating System | cisco | catos | 5.1\(1a\) | Yes |
| Operating System | cisco | catos | 5.1\(2a\) | Yes |
| Operating System | cisco | catos | 5.2 | Yes |
| Operating System | cisco | catos | 5.2\(1\) | Yes |
| Operating System | cisco | catos | 5.2\(1a\) | Yes |
| Operating System | cisco | catos | 5.2\(2\) | Yes |
| Operating System | cisco | catos | 5.2\(3\) | Yes |
| Operating System | cisco | catos | 5.2\(4\) | Yes |
| Operating System | cisco | catos | 5.2\(5\) | Yes |
| Operating System | cisco | catos | 5.2\(6\) | Yes |
| Operating System | cisco | catos | 5.2\(7\) | Yes |
| Operating System | cisco | catos | 5.3\(1\)csx | Yes |
| Operating System | cisco | catos | 5.3\(1a\)csx | Yes |
| Operating System | cisco | catos | 5.3\(2\)csx | Yes |
| Operating System | cisco | catos | 5.3\(3\)csx | Yes |
| Operating System | cisco | catos | 5.3\(4\)csx | Yes |
| Operating System | cisco | catos | 5.3\(5\)csx | Yes |
| Operating System | cisco | catos | 5.3\(5a\)csx | Yes |
| Operating System | cisco | catos | 5.3\(6\)csx | Yes |
| Operating System | cisco | catos | 5.4 | Yes |
| Operating System | cisco | catos | 5.4\(1\) | Yes |
| Operating System | cisco | catos | 5.4\(2\) | Yes |
| Operating System | cisco | catos | 5.4\(3\) | Yes |
| Operating System | cisco | catos | 5.4\(4\) | Yes |
| Operating System | cisco | catos | 5.5 | Yes |
| Operating System | cisco | catos | 5.5\(1\) | Yes |
| Operating System | cisco | catos | 5.5\(2\) | Yes |
| Operating System | cisco | catos | 5.5\(3\) | Yes |
| Operating System | cisco | catos | 5.5\(4\) | Yes |
| Operating System | cisco | catos | 5.5\(4a\) | Yes |
| Operating System | cisco | catos | 5.5\(4b\) | Yes |
| Operating System | cisco | catos | 5.5\(5\) | Yes |
| Operating System | cisco | catos | 5.5\(6\) | Yes |
| Operating System | cisco | catos | 5.5\(7\) | Yes |
| Operating System | cisco | catos | 5.5\(13\) | Yes |
| Operating System | cisco | catos | 6.1\(1\) | Yes |
| Operating System | cisco | catos | 6.1\(1a\) | Yes |
| Operating System | cisco | catos | 6.1\(1b\) | Yes |
| Operating System | cisco | catos | 6.1\(1c\) | Yes |
| Operating System | cisco | catos | 6.1\(2\) | Yes |
| Operating System | cisco | catos | 6.1\(2.13\) | Yes |
| Operating System | cisco | catos | 6.1\(3\) | Yes |
| Operating System | cisco | catos | 6.2\(0.110\) | Yes |
| Operating System | cisco | catos | 6.2\(0.111\) | Yes |
| Operating System | cisco | catos | 6.3\(0.7\)pan | Yes |
| Operating System | cisco | catos | 6.3\(4\) | Yes |
| Operating System | cisco | catos | 6.3\(5\) | Yes |
| Operating System | cisco | catos | 7.1 | Yes |
| Operating System | cisco | catos | 7.1\(2\) | Yes |
| Operating System | cisco | catos | 7.5\(1\) | Yes |
| Operating System | cisco | catos | 7.6\(1\) | Yes |