Security readout for executives and security teams
Plain-English summary
A low-privileged attacker who can reach a vulnerable UniFi Protect Application over the network may inject commands into its host device. Successful exploitation could expose data, alter systems, or disrupt service without user interaction. The available evidence does not clearly identify affected or fixed release ranges.
Executive priority
Treat this as an urgent remediation item for network-reachable UniFi Protect systems. Prioritize internet-facing or broadly accessible deployments because successful exploitation may compromise the host and materially affect confidentiality, integrity, and availability. Escalate version uncertainty directly to Ubiquiti or the responsible supplier.
Technical view
CVE-2026-77533 is an improper input validation vulnerability in Ubiquiti UniFi Protect Application that enables host command injection. Its CVSS 3.1 score is 9.9, reflecting network reachability, low complexity, low privileges, no user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure requires a UniFi Protect Application deployment that is vulnerable, network-reachable by the attacker, and accessible using low privileges. The supplied version entry of "0" and default status of unaffected do not establish a dependable affected-version boundary. Confirm exposure against Ubiquiti's advisory.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not marked as included in CISA KEV. Exploitation nevertheless appears potentially practical because the CVSS vector specifies network access, low complexity, low privileges, and no user interaction. No public exploit evidence is provided.
Researcher notes
The supplied CVE record maps the weakness to CWE-20 and describes command injection on the host. The affected data lists version "0" while declaring other versions unaffected, which is insufficient to infer a normal release range. The vendor advisory should be treated as authoritative for version boundaries and remediation details.
Mitigation direction
- Consult Ubiquiti's advisory for confirmed affected versions, fixed releases, and vendor-approved remediation.
- Apply the vendor-recommended update promptly after validating operational compatibility and recovery readiness.
- Restrict UniFi Protect access to trusted networks and authorized administrative paths.
- Review and remove unnecessary low-privileged accounts until remediation is confirmed.
Validation and detection
- Inventory every UniFi Protect Application deployment and record its exact installed version.
- Compare installed versions with the affected and fixed ranges confirmed by Ubiquiti.
- Verify application interfaces are inaccessible from untrusted networks and unauthorized segments.
- Review host and application telemetry for unexpected commands, processes, account changes, or configuration modifications.
- Confirm remediation through version checks and approved defensive testing without attempting exploitation.
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-2026-77533 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
- 9.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:N/S:C/C:H/I:H/A:H3.16UbiquitiVulnerability scoring details
Base CVSS 3.1 score
9.9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/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.