CVE-2026-95861 — Uncontrolled Recursion in Ubiquiti Inc Cloud Gateways
A malicious actor with access to the network could exploit an Uncontrolled Recursion vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Technical severity (high)+6
- Automatable exploitation (SSVC)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Ubiquiti Inc Cloud Gateways, Ubiquiti Inc Dream Machines, Ubiquiti Inc Dream Routers…).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Ubiquiti Inc | Cloud Gateways | < 5.1.31 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | Dream Machines | < 5.1.31 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | Dream Routers | < 5.1.31 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | Dream Wall | < 5.1.31 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | Enterprise Firewalls | < 5.1.31 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | Express | < 4.0.21 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | Express 7 | < 5.1.31 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Ubiquiti Inc | UniFi Gateways | < 5.1.26 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 7.5 | CVSS 3.1 | High | 3.9 | 3.6 | fe490ce8-0395-4072-90d8-2707e1bdf984 via NIST National Vulnerability Database |
| 7.5 | CVSS 3.1 | High | — | — | Ubiquiti via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: fe490ce8-0395-4072-90d8-2707e1bdf984) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Track CPU/memory spikes and availability drops correlated with request patterns.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · ubiquiti inc/dream machines, ubiquiti inc/enterprise firewalls, ubiquiti inc/dream routers, ubiquiti inc/cloud gateways,
- SSVC assessment updated
- Record published
- CVSS changed · 7.5
- Source status changed · → Deferred
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 15, 2026 – Oct 15, 2026
References
1 on the record
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-95862 Out-of-bounds Write in Ubiquiti Inc Dream Machines 23d
- High CVE-2026-77558 Out-of-bounds Read in Ubiquiti Inc Dream Machines 23d
- High CVE-2026-77544 Out-of-bounds Write in Ubiquiti Inc Dream Machines 23d
- High CVE-2026-77555 Out-of-bounds Write in Ubiquiti Inc Dream Machines 23d
- High CVE-2026-77556 Out-of-bounds Read in Ubiquiti Inc Dream Machines 23d
- Critical CVE-2026-77549 A malicious actor with access to the network and under certain conditions could exploit… Aug 26, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No FIRST EPSS score.
- No fixed version, patch or mitigation documented.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-95861 is "Uncontrolled Recursion in Ubiquiti Inc Cloud Gateways", rated High. It affects Cloud Gateways (Ubiquiti Inc); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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