CVE-2021-28511 Security feature bypass in EOS
Attackers can bypass security ACL drop rules if a NAT ACL permit rule matches, allowing unauthorized traffic forwarding on Arista EOS devices.
- 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-2021-28511?
CVE-2021-28511 is a medium-severity vulnerability in Arista Networks EOS, published on 5 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. This could allow a host with an IP address in a range that matches the range allowed by a NAT ACL and a range denied by a Security ACL to be forwarded incorrectly as it should have been denied by the Security ACL. This can enable an ACL bypass.
Weakness: CWE-284
Which versions are affected by CVE-2021-28511?
It affects 1 product.
Products include Arista Eos.
How do I fix CVE-2021-28511?
No fix has been published for CVE-2021-28511 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-28511 being exploited?
There is no known exploitation of CVE-2021-28511 in the wild and no public exploit code.
Other vulnerabilities in Arista Networks EOS
Sources
Also known as GHSA-7rjh-m68p-34pq.