PT-2019-3068 · Cisco · Cisco Ios Xr

Published 2019-08-07 · Updated 2020-10-16 · CVE-2019-1918

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS XR Software (affected versions not specified)

Description A vulnerability in the implementation of Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality could allow an unauthenticated attacker who is in the same IS-IS area to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of IS–IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending specific link-state PDUs to an affected system to be processed. A successful exploit could allow the attacker to cause incorrect calculations used in the weighted remote shared risk link groups (SRLG) or in the IGP Flexible Algorithm. It could also cause tracebacks to the logs or potentially cause the receiving device to crash the IS–IS process, resulting in a DoS condition.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Weakness Enumeration

CWE-682

CWE-20

Related Identifiers

BDU:2019-03050

CVE-2019-1918

Affected Products

Cisco Ios Xr

References · 4

• https://osv.dev/vulnerability/CVE-2019-1918 · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-03050 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-iosxr-isis-dos-1918 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-1918 · Security Note