Arista EOS up to 4.34.1F OSPFv3 Packet resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Arista EOS up to 4.31.0/4.31.8M/4.32.7M/4.33.4M/4.34.1F. This vulnerability affects unknown code of the component OSPFv3 Packet Handler. The manipulation leads to resource consumption. This vulnerability is documented as CVE-2025-8872. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Arista EOS up to 4.31.0/4.31.8M/4.32.7M/4.33.4M/4.34.1F and classified as critical. This issue affects an unknown functionality of the component OSPFv3 Packet Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

On affected platforms running Arista EOS with OSPFv3 configured, a specially crafted packet can cause the OSFPv3 process to have high CPU utilization which may result in the OSFPv3 process being restarted. This may cause disruption in the OSFPv3 routes on the switch. This issue was discovered internally by Arista and is not aware of any malicious uses of this issue in customer networks.

It is possible to read the advisory at arista.com. The identification of this vulnerability is CVE-2025-8872 since 08/11/2025. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-203841). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Arista

Name

• EOS

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17
• 4.18
• 4.19
• 4.20
• 4.21
• 4.22
• 4.23
• 4.24
• 4.25
• 4.26
• 4.27
• 4.28
• 4.29
• 4.30
• 4.31.0
• 4.31.8M
• 4.32.7M
• 4.33.4M
• 4.34.1F

License

• commercial

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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