CVE-2025-8873 Arista EOS Dataplane Denial of Service via Malformed IPsec Packet
A remote attacker can cause a denial of service for IPsec traffic on Arista EOS devices by sending a specially crafted packet.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-8873?
CVE-2025-8873 is a high-severity denial of service vulnerability in Arista Networks EOS, published on 4 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
On affected platforms running Arista EOS with IPsec configured, a specially crafted packet can cause the dataplane to stop processing all IPsec traffic. The control plane may detect this condition, and attempt to reset the IPsec processing pipeline. After reset traffic may not resume being processed. There is no impact to non-IPsec traffic or to IPsec traffic not originating or terminating on the system. This issue was reported by an Arista customer.
Weakness: CWE-1286
Which versions are affected by CVE-2025-8873?
How do I fix CVE-2025-8873?
No fix has been published for CVE-2025-8873 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-8873 being exploited?
There is no known exploitation of CVE-2025-8873 in the wild and no public exploit code.
Sources
Also known as GHSA-xhpm-f58r-37px.