CVE-2021-1268 Cisco IOS XR Software IPv6 Flood Denial of Service Vulnerability
An adjacent attacker can cause a denial of service on Cisco IOS XR management interfaces by injecting specific IPv6 multicast packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-1268?
CVE-2021-1268 is a high-severity denial of service vulnerability in Cisco Ios Xr, published on 4 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the IPv6 protocol handling of the management interfaces of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause an IPv6 flood on the management interface network of an affected device. The vulnerability exists because the software incorrectly forwards IPv6 packets that have an IPv6 node-local multicast group address destination and are received on the management interfaces. An attacker could exploit this vulnerability by connecting to the same network as the management interfaces and injecting IPv6 packets that have an IPv6 node-local multicast group address destination. A successful exploit could allow the attacker to cause an IPv6 flood on the corresponding network. Depending on the number of Cisco IOS XR Software nodes on that network segment, exploitation could cause excessive network traffic, resulting in network degradation or a denial of service (DoS) condition.
Weakness: CWE-1076
Which versions are affected by CVE-2021-1268?
It affects 1 product.
Products include Cisco Ios Xr.
How do I fix CVE-2021-1268?
No fix has been published for CVE-2021-1268 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-2021-1268 being exploited?
There is no known exploitation of CVE-2021-1268 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-374q-g769-jjp8.