CVE-2026-73455: CWE-130 Improper Handling of Length Parameter Inconsistency in Arista Networks EOS
CVE-2026-73455 is a high-severity vulnerability in Arista Networks EOS affecting the Open Shortest Path First version 3 (OSPFv3) implementation. A specially crafted packet can cause the OSPFv3 agent to restart unexpectedly, resulting in a denial of service condition. The vulnerability arises from improper handling of length parameter inconsistencies (CWE-130).
AI Analysis
Technical Summary
This vulnerability in Arista EOS occurs on platforms running OSPFv3 where a malformed packet triggers improper handling of length parameters, causing the OSPFv3 agent to crash and restart unexpectedly. This results in disruption of routing services. The CVSS 3.1 score is 7.5 (high), reflecting network attack vector, low complexity, no privileges or user interaction required, and impact limited to availability (denial of service).
Potential Impact
Successful exploitation causes the OSPFv3 agent to restart, leading to temporary loss of routing functionality and potential network disruption. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, consider network-level protections such as filtering malformed OSPFv3 packets if feasible.
CVE-2026-73455: CWE-130 Improper Handling of Length Parameter Inconsistency in Arista Networks EOS
Description
CVE-2026-73455 is a high-severity vulnerability in Arista Networks EOS affecting the Open Shortest Path First version 3 (OSPFv3) implementation. A specially crafted packet can cause the OSPFv3 agent to restart unexpectedly, resulting in a denial of service condition. The vulnerability arises from improper handling of length parameter inconsistencies (CWE-130).
CVSS v3.1
Score 7.5high
Affected software
Arista Networks
EOS
pkg:github/arista-networks/eosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Arista EOS occurs on platforms running OSPFv3 where a malformed packet triggers improper handling of length parameters, causing the OSPFv3 agent to crash and restart unexpectedly. This results in disruption of routing services. The CVSS 3.1 score is 7.5 (high), reflecting network attack vector, low complexity, no privileges or user interaction required, and impact limited to availability (denial of service).
Potential Impact
Successful exploitation causes the OSPFv3 agent to restart, leading to temporary loss of routing functionality and potential network disruption. There is no confidentiality or integrity impact reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, consider network-level protections such as filtering malformed OSPFv3 packets if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:45:03.510Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaa692755bf5e2cf553d91d
Added to database: 09/16/2026, 10:02:15 UTC
Last enriched: 09/16/2026, 10:16:27 UTC
Last updated: 09/16/2026, 11:01:23 UTC
Views: 4
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