CVE-2021-1389 Cisco IOS XR and Cisco NX-OS Software IPv6 Access Control List Bypass Vulnerability
Remote attackers can bypass IPv6 access control lists on Cisco IOS XR and NX-OS devices by sending crafted packets, accessing protected resources.
- 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-2021-1389?
CVE-2021-1389 is a medium-severity vulnerability in Cisco Ios Xr, published on 4 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the IPv6 traffic processing of Cisco IOS XR Software and Cisco NX-OS Software for certain Cisco devices could allow an unauthenticated, remote attacker to bypass an IPv6 access control list (ACL) that is configured for an interface of an affected device. The vulnerability is due to improper processing of IPv6 traffic that is sent through an affected device. An attacker could exploit this vulnerability by sending crafted IPv6 packets that traverse the affected device. A successful exploit could allow the attacker to access resources that would typically be protected by the interface ACL.
Weakness: CWE-284
Which versions are affected by CVE-2021-1389?
It affects 2 products.
Products include Cisco Ios Xr, Cisco Nx-Os.
How do I fix CVE-2021-1389?
No fix has been published for CVE-2021-1389 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-1389 being exploited?
There is no known exploitation of CVE-2021-1389 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xr
- CVE-2020-3118 Cisco IOS XR Software Discovery Protocol Format String
- CVE-2020-3569 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2020-3566 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2010-3035 Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service
- CVE-2022-20821 Cisco IOS XR Open Port
Sources
Also known as GHSA-r95g-ccc3-r2m4.