7.4

CVE-2024-20406: cisco cisco ios xr software Improper Input Validation

CVSS: 7.4v3.1HighAnalyzed
Published 11-09-2024Last modified 11-09-2024
Open JSON

Vulnerability summary

CVE-2024-20406 is a high (CVSS 7.4) Improper Input Validation vulnerability in cisco cisco ios xr software. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 13.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-09-2024
    PublishedVulnerability first disclosed.
  2. 11-09-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

0.00 pp

From 0.24% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco2 products
  • cisco ios xr software7.4.1 | 6.8.1 | 7.4.15 | 7.5.1 | 7.4.16 | 7.6.1 | 7.5.2 | 7.8.1 | 7.6.15 | 7.5.12 | 7.7.1 | 6.8.2 | 7.4.2 | 6.9.1 | 7.6.2 | 7.5.3 | 7.7.2 | 6.9.2 | 7.9.1 | 7.10.1 | 7.8.2 | 7.5.4 | 7.8.22 | 7.7.21 | 7.9.2 | 7.5.5 | 7.11.1 | 7.9.21 | 7.10.2 | 7.6.3
  • ios_xr≥ 6.8.1, < 7.0.0 | ≥ 7.4.1, < 7.11.2

1 vendor · 2 products

References

1 links