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

1) Resource management error

EUVDB-ID: #VU56421

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-2021-34713

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper management of internal resources in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers. A remote attacker on the local network can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco ASR 9000 Series Aggregation Services Routers: 6.4 - 7.1

Cisco ASR 9001 Router: All versions

CPE2.3

• cpe:2.3:h:cisco_systems:cisco_asr_9000_series_aggregation_services_routers:6.4:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_asr_9000_series_aggregation_services_routers:6.4.1:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_asr_9000_series_aggregation_services_routers:6.4.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_asr_9001_router:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-npspin-QYpwdhFD

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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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