Ubiquiti UniFi Gateway Updates Fix Six Denial-of-Service Flaws
Tech GuruQuick Answer
The authority published Security Advisory Bulletin 069 for Ubiquiti UniFi gateways and consoles. Ubiquiti corrected unauthenticated network denial-of-service conditions involving out-of-bounds memory operations and recursion in affected gateway releases. Affected deployments should be matched to the authority's exact scope and moved to the supported fixed release.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory Ubiquiti UniFi gateways and consoles, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Last verified: 2026-09-23 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Ubiquiti UniFi gateways and consoles |
|---|---|
| Advisory | Security Advisory Bulletin 069 |
| CVEs | CVE-2026-77544, CVE-2026-77555, CVE-2026-77556, CVE-2026-77558, CVE-2026-95861, CVE-2026-95862 |
| Authoritative release date | 2026-09-22 18:34:39.993 UTC |
| Authority revision date | 2026-09-22 18:49:39.376 UTC |
| Affected versions | Dream Machines, Enterprise Firewalls, Dream Routers, Cloud Gateways, Dream Wall, and Express 7 before 5.1.31; Express before 4.0.21; UniFi Gateways before 5.1.26 |
| Fixed version | Applicable platform release 5.1.31, Express 4.0.21, or UniFi Gateway 5.1.26 |
| CVSS base score | 7.5 (CVSS v3.1) |
| CVSS severity | High |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
Ubiquiti corrected unauthenticated network denial-of-service conditions involving out-of-bounds memory operations and recursion in affected gateway releases.
What To Validate Now
- Inventory. Locate Ubiquiti UniFi gateways and consoles deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Compare each deployment with the authority's affected-version statement: Dream Machines, Enterprise Firewalls, Dream Routers, Cloud Gateways, Dream Wall, and Express 7 before 5.1.31; Express before 4.0.21; UniFi Gateways before 5.1.26 Do not infer applicability from product family or severity alone.
- Remediate. Apply Applicable platform release 5.1.31, Express 4.0.21, or UniFi Gateway 5.1.26 through the supported vendor or project channel, following the current advisory and change-control requirements.
- Validate. Confirm the resulting version or managed-service state, exercise representative functionality and recovery paths, monitor for regressions, and document exceptions.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Use the exact supported release stream and repository. Test dependencies, clusters, integrations, and rollback before broad deployment; a CVSS rating or reachable feature is not evidence of exploitation.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
