A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to ex
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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Sep 22, 2026
- Updated
- Sep 22, 2026
- EPSS
- 0.5% · 37th percentile
- CWE
- CWE-787
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Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Ubiquiti
- 7.5
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Ubiquiti). Independent of NVD's CPE analysis and usually ahead of it.
Ubiquiti Inc Cloud Gateways
- before 5.1.31affected · semver
Ubiquiti Inc Dream Machines
- before 5.1.31affected · semver
Ubiquiti Inc Dream Routers
- before 5.1.31affected · semver
Ubiquiti Inc Dream Wall
- before 5.1.31affected · semver
Ubiquiti Inc Enterprise Firewalls
- before 5.1.31affected · semver
Ubiquiti Inc Express
- before 4.0.21affected · semver
Ubiquiti Inc Express 7
- before 5.1.31affected · semver
Ubiquiti Inc UniFi Gateways
- before 5.1.26affected · semver
Same product
ubiquiti inc: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-95862A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to ex30Monitor
- CVE-2026-95861A malicious actor with access to the network could exploit an Uncontrolled Recursion vulnerability found in certain UniFi gateway devices to30Monitor
- CVE-2026-77558A malicious actor with access to the network could exploit an Out-of-bounds Read vulnerability found in certain UniFi gateway devices to exe30Monitor
- CVE-2026-77556A malicious actor with access to the network could exploit an Out-of-bounds Read vulnerability found in certain UniFi gateway devices to exe30Monitor
- CVE-2026-77555A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to ex30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Ubiquiti Inc Cloud Gateways | 5.1.31 | Vendor (CNA) |
| Ubiquiti Inc Dream Machines | 5.1.31 | Vendor (CNA) |
| Ubiquiti Inc Dream Routers | 5.1.31 | Vendor (CNA) |
| Ubiquiti Inc Dream Wall | 5.1.31 | Vendor (CNA) |
| Ubiquiti Inc Enterprise Firewalls | 5.1.31 | Vendor (CNA) |
| Ubiquiti Inc Express | 4.0.21 | Vendor (CNA) |
| Ubiquiti Inc Express 7 | 5.1.31 | Vendor (CNA) |
| Ubiquiti Inc UniFi Gateways | 5.1.26 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-775550 days apartA malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to ex30Monitor
- CVE-2026-958620 days apartA malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to ex30Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.