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7.4

Cisco Network Convergence System: Denial of Service via Specific Ethernet Frames

CVE-2024-20317 · published 2 years ago
Summary

A security issue in Cisco's Network Convergence System could cause a denial of service if an attacker sends specific types of Ethernet frames to a connected device. This could disrupt communication between devices on the network. Cisco has released software updates to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco ios_xr 7.7.1
7.7.2
7.7.21
7.8.1
7.8.2
7.8.22
7.9.1
7.9.2
7.9.21
7.10.1
cpe:2.3:o:cisco:ios_xr:7.7.1:*:*:*:*:*:*:*
Original advisory text
A vulnerability in the handling of specific Ethernet frames by Cisco IOS XR Software for various Cisco Network Convergence System (NCS) platforms could allow an unauthenticated, adjacent attacker t...
A vulnerability in the handling of specific Ethernet frames by Cisco IOS XR Software for various Cisco Network Convergence System (NCS) platforms could allow an unauthenticated, adjacent attacker to cause critical priority packets to be dropped, resulting in a denial of service (DoS) condition.

This vulnerability is due to incorrect classification of certain types of Ethernet frames that are received on an interface. An attacker could exploit this vulnerability by sending specific types of Ethernet frames to or through the affected device. A successful exploit could allow the attacker to cause control plane protocol relationships to fail, resulting in a DoS condition. For more information, see the section of this advisory.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
7.4 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-684Incorrect Provision of Specified Functionality
Timeline
Published11 Sep 2024
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2024-20317 · NVD
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