CISA ADP Vulnrichment

Answer in brief

CVE-2026-77555 records a High severity (CVSS 7.5) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps Ubiquiti Inc/Cloud Gateways (generic), Ubiquiti Inc/Dream Machines (generic), Ubiquiti Inc/Dream Routers (generic), Ubiquiti Inc/Dream Wall (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 8 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Ubiquiti Inc/Cloud Gateways (generic), Ubiquiti Inc/Dream Machines (generic), Ubiquiti Inc/Dream Routers (generic), Ubiquiti Inc/Dream Wall (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Ubiquiti Inc/Cloud Gatewaysgeneric	>=0 <5.1.31	5.1.31
Ubiquiti Inc/Dream Machinesgeneric	>=0 <5.1.31	5.1.31
Ubiquiti Inc/Dream Routersgeneric	>=0 <5.1.31	5.1.31
Ubiquiti Inc/Dream Wallgeneric	>=0 <5.1.31	5.1.31
Ubiquiti Inc/Enterprise Firewallsgeneric	>=0 <5.1.31	5.1.31
Ubiquiti Inc/Expressgeneric	>=0 <4.0.21	4.0.21
Ubiquiti Inc/Express 7generic	>=0 <5.1.31	5.1.31
Ubiquiti Inc/UniFi Gatewaysgeneric	>=0 <5.1.26	5.1.26

Recommended response

Check inventory. Check lockfiles and deployed manifests for Ubiquiti Inc/Cloud Gateways, Ubiquiti Inc/Dream Machines, Ubiquiti Inc/Dream Routers.
Review the reported fix. Update Ubiquiti Inc/Cloud Gateways to 5.1.31; Ubiquiti Inc/Dream Machines to 5.1.31; Ubiquiti Inc/Dream Routers to 5.1.31; Ubiquiti Inc/Dream Wall to 5.1.31; Ubiquiti Inc/Enterprise Firewalls to 5.1.31; Ubiquiti Inc/Express to 4.0.21; Ubiquiti Inc/Express 7 to 5.1.31; Ubiquiti Inc/UniFi Gateways to 5.1.26 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Source referencecommunity.ui.com

Upstream source description

A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device.

Quoted source text, attributed separately from HOL analysis.