Security readout for executives and security teams
Plain-English summary
A highly privileged attacker with network access to UniFi Network Application could cause commands to run on an adopted device. Successful exploitation could compromise data, configurations, and service availability. The supplied record does not identify usable affected-version boundaries or a confirmed fix.
Executive priority
Treat as an urgent validation and remediation task because successful exploitation could fully affect managed devices. Prioritize internet-accessible or broadly reachable management deployments, while recognizing that exploitation requires high privileges and is not reported as active in the supplied evidence.
Technical view
CVE-2026-77535 is an improper input validation vulnerability enabling command injection on an adopted device. CVSS 3.1 is 9.1: network reachable, low complexity, high privileges required, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure requires a reachable UniFi Network Application, an adopted device, and attacker access with high privileges. The bundled version value of "0" is not actionable, while default status is listed as unaffected. Confirm applicability directly against Ubiquiti's advisory and deployment versions.
Exploitation context
The bundle does not show this CVE in KEV and provides no cited evidence of active exploitation or public exploit availability. Exploitation is constrained by the high-privilege requirement, but impact could extend from the application to adopted devices.
Researcher notes
The record maps CWE-20 and describes command injection, but supplies no vulnerable code path, indicators, affected-version range, or patch details. The version entry "0" and default-unaffected status require vendor clarification. Avoid treating the CVSS network vector as proof that anonymous internet exploitation is possible.
Mitigation direction
- Review Ubiquiti Security Advisory Bulletin 067 for affected versions and vendor-approved remediation.
- Upgrade only to a fixed release explicitly identified by Ubiquiti guidance.
- Restrict UniFi management access to trusted administrative networks and authorized personnel.
- Review and reduce high-privilege accounts until remediation is confirmed.
- Isolate the management plane from untrusted and general user networks.
Validation and detection
- Inventory UniFi Network Application versions and all adopted devices.
- Compare each installed version with Ubiquiti Security Advisory Bulletin 067.
- Audit high-privilege accounts, recent access, and unexpected permission changes.
- Review available logs for unexplained commands, configuration changes, or adopted-device anomalies.
- Verify management interfaces are inaccessible from untrusted network segments.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-77535 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H2.36UbiquitiVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9CVE reference, Ubiquiti
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.