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01 Record

CVE-2026-77558

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

HighPUBLISHEDCNA: Ubiquiti
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.52% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 44.0% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Deferred. NVD last modified this record on 2026-09-22.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-22 18:43Z1 MO AGO
Last updated
2026-09-22 19:33Z1 MO AGO
Reserved
2026-08-20
Assigning CNA
Ubiquiti
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
Data version
5.2
Document digest
de87cde86354eb98409bede9ab819772b8a9f671286ea15a4204512c3f3d5252

05 Affected products

VendorProductVersionsPlatforms
Ubiquiti IncDream Machines0 to < 5.1.31—
Ubiquiti IncEnterprise Firewalls0 to < 5.1.31—
Ubiquiti IncDream Routers0 to < 5.1.31—
Ubiquiti IncCloud Gateways0 to < 5.1.31—
Ubiquiti IncDream Wall0 to < 5.1.31—
Ubiquiti IncExpress0 to < 4.0.21—
Ubiquiti IncExpress 70 to < 5.1.31—
Ubiquiti IncUniFi Gateways0 to < 5.1.26—

06 References