CVE-2026-73453 Security Advisory 0174
Unauthenticated attackers can achieve arbitrary code execution and administrative control on Arista EOS switches if P4Runtime is enabled.
- 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-2026-73453?
CVE-2026-73453 is a critical code injection vulnerability in Arista Networks EOS, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. P4Runtime is disabled by default in Arista EOS. By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch.
This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Weakness: CWE-94
Which versions are affected by CVE-2026-73453?
How do I fix CVE-2026-73453?
No fix has been published for CVE-2026-73453 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-73453 being exploited?
There is no known exploitation of CVE-2026-73453 in the wild and no public exploit code.
Sources
Also known as GHSA-383x-9pf8-56g8.