Security readout for executives and security teams
Plain-English summary
CVE-2026-77545 is a critical privilege-escalation flaw in certain UniFi OS devices or instances. A network-connected attacker with low privileges could, under unspecified conditions, gain broader control, potentially compromising sensitive data, configuration integrity, and availability. The supplied sources do not identify confirmed affected version ranges.
Executive priority
Treat this as an urgent verification task because successful exploitation could provide extensive control of security and infrastructure appliances. Require rapid asset inventory and vendor-advisory review, but avoid declaring systems vulnerable until Ubiquiti's affected-version information confirms exposure.
Technical view
This is an Active Debug Code weakness (CWE-489) scored CVSS 9.0. The vector indicates network access, low privileges, low complexity, required user interaction, changed scope, and high confidentiality, integrity, and availability impacts. The required interaction and other exploitation conditions are not explained in the supplied evidence.
Likely exposure
Potential exposure exists where UniFi OS devices or instances are reachable by low-privileged users over a network. However, every supplied product entry is marked defaultStatus unaffected, and no confirmed vulnerable version range is provided. Exact organizational exposure therefore requires clarification from Ubiquiti's advisory.
Exploitation context
The supplied bundle says exploitation requires network access, low privileges, user interaction, and additional unspecified conditions. It provides no exploit details. The CVE is not listed as KEV in the bundle, and no cited evidence establishes active exploitation.
Researcher notes
The affected-product data is internally inconclusive: each entry contains version "0" and is marked defaultStatus unaffected. The description nevertheless references certain UniFi OS devices or instances. The CVSS requirement for user interaction is also unexplained. Researchers should rely on the vendor bulletin and CVE record for clarified prerequisites and version boundaries.
Mitigation direction
- Review Ubiquiti Security Advisory Bulletin 067 for confirmed affected versions and vendor-prescribed remediation.
- Inventory all UniFi OS devices, instances, models, and installed versions.
- Restrict UniFi OS management access to trusted administrative networks and authorized users.
- Reduce or disable unnecessary low-privileged accounts pending vendor clarification.
- Apply vendor-recommended updates or mitigations after confirming applicability.
Validation and detection
- Compare every deployed UniFi OS version and model against Ubiquiti's advisory.
- Confirm management interfaces are inaccessible from untrusted networks.
- Review account permissions and remove unnecessary low-privileged access.
- Inspect available audit records for unexpected privilege or configuration changes.
- Verify vendor-recommended remediation is applied to every confirmed affected asset.
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-489: 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 lookupCVE-2026-77545 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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.
SSVC decision data
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:L/UI:R/S:C/C:H/I:H/A:H2.36UbiquitiVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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.
ADP provider summaries
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.
Active Debug Code
Active Debug Code represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.