The packet-reassembly implementation in Cisco IOS XE 3.13S and earlier allows remote attackers to cause a denial of service (CPU consumption or packet loss) via fragmented (1) IPv4 or (2) IPv6 packets that trigger ATTN-3-SYNC_TIMEOUT errors after reassembly failures, aka Bug ID CSCuo37957.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ios_xe | Cisco | 2.1.0 (including) | 2.1.0 (including) |
| Ios_xe | Cisco | 2.1.1 (including) | 2.1.1 (including) |
| Ios_xe | Cisco | 2.1.2 (including) | 2.1.2 (including) |
| Ios_xe | Cisco | 2.2.1 (including) | 2.2.1 (including) |
| Ios_xe | Cisco | 2.2.2 (including) | 2.2.2 (including) |
| Ios_xe | Cisco | 2.2.3 (including) | 2.2.3 (including) |
| Ios_xe | Cisco | 2.3.0 (including) | 2.3.0 (including) |
| Ios_xe | Cisco | 2.3.0t (including) | 2.3.0t (including) |
| Ios_xe | Cisco | 2.3.1t (including) | 2.3.1t (including) |
| Ios_xe | Cisco | 2.3.2 (including) | 2.3.2 (including) |
| Ios_xe | Cisco | 2.4.0 (including) | 2.4.0 (including) |
| Ios_xe | Cisco | 2.4.1 (including) | 2.4.1 (including) |
| Ios_xe | Cisco | 2.5.0 (including) | 2.5.0 (including) |
| Ios_xe | Cisco | 2.5.1 (including) | 2.5.1 (including) |
| Ios_xe | Cisco | 2.5.2 (including) | 2.5.2 (including) |
| Ios_xe | Cisco | 2.6.0 (including) | 2.6.0 (including) |
| Ios_xe | Cisco | 2.6.1 (including) | 2.6.1 (including) |
| Ios_xe | Cisco | 2.6.2 (including) | 2.6.2 (including) |
| Ios_xe | Cisco | 3.10s.0 (including) | 3.10s.0 (including) |
| Ios_xe | Cisco | 3.10s.0a (including) | 3.10s.0a (including) |
| Ios_xe | Cisco | 3.10s.1 (including) | 3.10s.1 (including) |
| Ios_xe | Cisco | 3.10s.2 (including) | 3.10s.2 (including) |
| Ios_xe | Cisco | 3.10s.3 (including) | 3.10s.3 (including) |
| Ios_xe | Cisco | 3.11s.0 (including) | 3.11s.0 (including) |
| Ios_xe | Cisco | 3.11s.1 (including) | 3.11s.1 (including) |
| Ios_xe | Cisco | 3.11s.2 (including) | 3.11s.2 (including) |
| Ios_xe | Cisco | 3.12s.0 (including) | 3.12s.0 (including) |
| Ios_xe | Cisco | 3.12s.1 (including) | 3.12s.1 (including) |
| Ios_xe | Cisco | 3.13s.0 (including) | 3.13s.0 (including) |