CVE-2026-77555: ubiquiti inc cloud gateways Out-of-bounds Write
CVSS: 7.5v3.1HighDeferred
Published 22-09-2026Last modified 22-09-2026
Vulnerability summary
CVE-2026-77555 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in ubiquiti inc cloud gateways. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.5% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.46%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 22-09-2026PublishedVulnerability first disclosed.
- 22-09-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.46%
Chance of exploitation in the next 30 days
Percentile
39%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
23-09-202620-10-2026
EPSS score0.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubiquiti inc8 products
- cloud gateways< 5.1.31
- dream machines< 5.1.31
- dream routers< 5.1.31
- dream wall< 5.1.31
- enterprise firewalls< 5.1.31
1 vendor · 8 products