CVE-2022-20823 Cisco NX-OS Software OSPFv3 Denial of Service Vulnerability
An unauthenticated remote attacker can cause a denial of service by sending malicious OSPFv3 packets to Cisco NX-OS devices with OSPFv3 enabled.
- 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-2022-20823?
CVE-2022-20823 is a high-severity denial of service vulnerability in Cisco NX-OS Software, published on 25 Aug 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the OSPF version 3 (OSPFv3) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incomplete input validation of specific OSPFv3 packets. An attacker could exploit this vulnerability by sending a malicious OSPFv3 link-state advertisement (LSA) to an affected device. A successful exploit could allow the attacker to cause the OSPFv3 process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The OSPFv3 feature is disabled by default. To exploit this vulnerability, an attacker must be able to establish a full OSPFv3 neighbor state with an affected device. For more information about exploitation conditions, see the Details section of this advisory.
Which versions are affected by CVE-2022-20823?
It affects 147 products.
Products include Cisco Nexus 3016 Firmware, Cisco Nexus 3016q Firmware, Cisco Nexus 3048 Firmware, Cisco Nexus 3064-32t Firmware, Cisco Nexus 3064-T Firmware, Cisco Nexus 3064-X Firmware and 141 more.
How do I fix CVE-2022-20823?
No fix has been published for CVE-2022-20823 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-2022-20823 being exploited?
There is no known exploitation of CVE-2022-20823 in the wild and no public exploit code.
Sources
Also known as GHSA-g29q-52vq-fhwp.