#VU67372 Buffer overflow in Cisco IOS XR - CVE-2022-20846

Vulnerability identifier: #VU67372

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20846

CWE-ID: CWE-120

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco IOS XR
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to insufficient validation of certain Cisco Discovery Protocol messages. A remote non-authenticated attacker on the local network can send specially crafted Cisco Discovery Protocol packets to the affected device and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 5.2.2 - 5.2.47, 5.3.0 - 5.3.4, 6.0 - 6.0.2, 6.1 - 6.1.45, 6.2.1 - 6.2.25, 6.3.1 - 6.3.15, 6.4.0 - 6.4.3, 6.5.1 - 6.5.93, 6.6 - 6.6.25, 6.7 - 6.7.4, 6.8 - 6.8.1, 7.0 - 7.0.90, 7.1 - 7.1.25, 7.2.0 - 7.2.12, 7.3 - 7.3.15, 7.4 - 7.4.2, 7.5.0 - 7.5.1, 7.6.0 - 7.6.1, 7.7.0

---

External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-cdp-wnALzvT2
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb23263

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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