Medium5.3Cisco

Medium [CVE-2026-20080] Cisco IEC6400 Wireless Backhaul Edge Compute Software SSH Denial of Service Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20080 affecting Cisco Ultra-Reliable Wireless Backhaul.

cisco-sa-iec6400-Pem5uQ7v Published Jan 21, 2026Updated by vendor Jan 21, 2026

CVE-2026-20080

Affected products & platforms

CiscoWireless

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Summary

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. Cisco has released software updat…

Affected product named by the advisory: Cisco Ultra-Reliable Wireless Backhaul.

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco IEC6400 Wireless Backhaul Edge Compute Software if it had the SSH service enabled. The SSH service is enabled by default.
Release 1.1.0 and earlier (first fixed: 1.2.0)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

1.2.0

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
Release 1.1.0 and earlier: upgrade to 1.2.0.

Workaround status

There are no workarounds that address this vulnerability. However, as a mitigation, customers who do not require the SSH service can disable it either by using the ssh-server disable CLI command or by unchecking the SSH checkbox on the Misc Settings page in the web UI.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisories (PSIRT)official
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20080NVD CVE.org MITRE

Official resources

Cisco Catalyst 9800 Wireless Controller upgrade guide (target: 1.2.0)
Official documentation
This advisory names 1.2.0 as the first fixed release — official upgrade documentation for Cisco Catalyst 9800 Wireless LAN Controllers.

Discussion(0)

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