CVE-2023-20049: Cisco IOS XR Software for ASR 9000 Series Routers Bidirectional Forwarding Detection Denial of Service Vulnerability
First published: Thu Mar 09 2023(Updated: )
A vulnerability in the bidirectional forwarding detection (BFD) hardware offload feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed BFD packets that are received on line cards where the BFD hardware offload feature is enabled. An attacker could exploit this vulnerability by sending a crafted IPv4 BFD packet to an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset, resulting in loss of traffic over that line card while the line card reloads.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | <7.5.3 | |
| Cisco IOS XR | >=7.6<7.6.2 | |
| Cisco IOS XR | =7.7 | |
| Cisco Asr 9000v-v2 | ||
| Cisco Asr 9001 | ||
| Cisco Asr 9006 | ||
| Cisco Asr 9010 | ||
| Cisco Asr 9901 | ||
| Cisco Asr 9902 | ||
| Cisco Asr 9903 | ||
| Cisco Asr 9904 | ||
| Cisco Asr 9906 | ||
| Cisco Asr 9910 | ||
| Cisco Asr 9912 | ||
| Cisco Asr 9922 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2023-20049?
The severity of CVE-2023-20049 is high (7.5).
Which Cisco products are affected by CVE-2023-20049?
Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers are affected.
Is Cisco Asr 9000v-v2 vulnerable to CVE-2023-20049?
No, Cisco Asr 9000v-v2 is not vulnerable to CVE-2023-20049.
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- source/MITRE
- agent/title
- agent/severity
- agent/last-modified-date
- agent/author
- agent/weakness
- agent/tags
- agent/references
- agent/description
- agent/first-publish-date
- agent/event
- vendor/cisco
- canonical/cisco ios xr
- version/cisco ios xr/7.6
- version/cisco ios xr/7.7
- canonical/cisco asr 9000v-v2
- canonical/cisco asr 9001
- canonical/cisco asr 9006
- canonical/cisco asr 9010
- canonical/cisco asr 9901
- canonical/cisco asr 9902
- canonical/cisco asr 9903
- canonical/cisco asr 9904
- canonical/cisco asr 9906
- canonical/cisco asr 9910
- canonical/cisco asr 9912
- canonical/cisco asr 9922