CVE-2021-1591 Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability
Unauthenticated remote attackers can bypass Access Control List rules on Cisco Nexus 9500 switches due to resource oversubscription in EtherChannel logic.
- 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-2021-1591?
CVE-2021-1591 is a medium-severity vulnerability in Cisco Nx-Os, published on 25 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.
Weakness: CWE-284
Which versions are affected by CVE-2021-1591?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2021-1591?
No fix has been published for CVE-2021-1591 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-1591 being exploited?
There is no known exploitation of CVE-2021-1591 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-7mcq-4g86-cgx3.