Denial of service in Cisco IOS XR Software for ASR 9000 Series Routers

1) Input validation error

EUVDB-ID: #VU73203

Risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20049

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to the incorrect handling of malformed BFD packets that are received on line cards where the bidirectional forwarding detection (BFD) hardware offload feature is enabled. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 6.5 - 7.7.0

Cisco ASR 9000 Series Aggregation Services Routers: All versions

ASR 9902 Compact High-Performance Routers: All versions

ASR 9903 Compact High-Performance Routers: All versions

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bfd-XmRescbT

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.