SB2020080610 - Denial of service in Cisco IOS XR Software

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Main Vulnerability Database SB2020080610

SB2020080610 - Denial of service in Cisco IOS XR Software

Published: August 6, 2020

Security Bulletin ID SB2020080610
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Infinite loop (CVE-ID: CVE-2020-3449)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 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/E:U/U:Green


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.


Remediation

Install update from vendor's website.

References