CVE-2026-20080 Cisco IEC6400 Edge Compute Appliance SSH Denial of Service Vulnerability
Unauthenticated remote attackers can cause the SSH service to stop responding via a flood attack, requiring administrators to patch the Cisco IEC6400 appliance.
- 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-2026-20080?
CVE-2026-20080 is a medium-severity denial of service vulnerability in Cisco Ultra-Reliable Wireless Backhaul, published on 21 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the SSH service of Cisco IEC6400 Wireless Backhaul Edge Compute Software could allow an unauthenticated, remote attacker to cause the SSH service to stop responding. This vulnerability exists because the SSH service lacks effective flood protection. An attacker could exploit this vulnerability by initiating a denial of service (DoS) attack against the SSH port. A successful exploit could allow the attacker to cause the SSH service to be unresponsive during the period of the DoS attack. All other operations remain stable during the attack.
Weakness: CWE-400
Which versions are affected by CVE-2026-20080?
How do I fix CVE-2026-20080?
No fix has been published for CVE-2026-20080 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-2026-20080 being exploited?
There is no known exploitation of CVE-2026-20080 in the wild and no public exploit code.
Sources
Also known as GHSA-4rv8-3xqf-8gfm.