Infinite loop in Cisco IOS XR - CVE-2020-3449
Published: August 6, 2020
Vulnerability identifier: #VU34091
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-2020-3449
CWE-ID: CWE-835
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 an incorrect calculation of lexicographical order when displaying additional path information within the Border Gateway Protocol (BGP) additional paths feature. A remote attacker can send a specific BGP update from a BGP neighbor peer session of an affected device, consume all available system resources and cause denial of service conditions.
Affected software
Cisco IOS XR
How to mitigate CVE-2020-3449
Install updates from vendor's website.
Cisco IOS XR - addressed in versions 7.1.3, 7.2.1, 7.3.1