CVE-2021-28510 Denial of service in EOS
An attacker can cause a denial of service on Arista EOS devices by sending malformed PTP packets that trigger repeated PTP agent restarts.
- 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-2021-28510?
CVE-2021-28510 is a medium-severity denial of service vulnerability in Arista Networks EOS, published on 24 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
For certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with an invalid Type-Length-Value (TLV) causes the PTP agent to restart. Repeated restarts of the service will make the service unavailable.
Which versions are affected by CVE-2021-28510?
It affects 1 product.
Products include Arista Eos.
How do I fix CVE-2021-28510?
No fix has been published for CVE-2021-28510 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-2021-28510 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-28510 exists.
Other vulnerabilities in Arista Networks EOS
Sources
Also known as GHSA-c5c5-rwc6-67m5.