Input validation error in Cisco IOS XR - CVE-2021-34720
Published: September 9, 2021
Vulnerability identifier: #VU56428
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34720
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to socket creation failures are mishandled during the IP Service Level Agreements (IP SLA) and Two-Way Active Measurement Protocol (TWAMP) processes. A remote attacker can send specially crafted IP SLA or TWAMP packets and perform a denial of service (DoS) attack.
Affected software
Cisco IOS XR
How to mitigate CVE-2021-34720
Install updates from vendor's website.
Cisco IOS XR - addressed in versions 6.2.3, 6.3.2, 6.3.3, 6.7.4, 7.2.2