CVE-2026-20074

CWE-12874 documents4 sources
Severity
7.4HIGH
EPSS
0.0%
top 87.05%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Cisco Cisco IOS XR Software
Timeline
PublishedMar 11

Description

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) multi-instance routing feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the IS-IS process to restart unexpectedly. This vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending crafted IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause…

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HExploitability: 2.8 | Impact: 4.0

Affected Packages1 packages

▶CVEListV5cisco/cisco_ios_xr_software32 versions+31

🔴Vulnerability Details

2
CVEList
Cisco IOS XR Software Multi-Instance Intermediate System-to-Intermediate System Denial of Service Vulnerability↗2026-03-11
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GHSA
GHSA-95m8-qgxc-hcqx: A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) multi-instance routing feature of Cisco IOS XR Software could allow an unaut↗2026-03-11
▶

📋Vendor Advisories

1
Cisco
Cisco IOS XR Software Multi-Instance Intermediate System-to-Intermediate System Denial of Service Vulnerability↗2026-03-11
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CVE-2026-20074 (HIGH CVSS 7.4) | A vulnerability in the Intermediate | cvebase.io