Security readout for executives and security teams
Plain-English summary
This critical UniFi Protect flaw may let an unauthenticated attacker with network access run commands on the host device. Successful exploitation could compromise sensitive data, alter the system, and disrupt service. The supplied records do not provide an actionable affected-version range or confirmed fixed version.
Executive priority
Treat as an immediate verification and remediation priority because successful exploitation could provide unauthenticated host-level command execution. Identify reachable UniFi Protect systems, confirm applicability through Ubiquiti's advisory, restrict exposure, and apply vendor guidance. Escalate suspected compromise for incident response.
Technical view
CVE-2026-77537 is an improper input validation flaw in the UniFi Protect Application leading to host command injection. Its CVSS 3.1 score is 10.0: network-accessible, low complexity, no privileges or user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Potential exposure exists where a vulnerable UniFi Protect Application accepts traffic from an attacker-accessible network. The source bundle identifies version "0" while marking unspecified versions unaffected, so it does not establish a reliable affected-version range. Each deployment requires confirmation against Ubiquiti's advisory.
Exploitation context
The bundle states that a malicious actor with network access could exploit the flaw. It contains no evidence of active exploitation, and the CVE is not identified as being in KEV. No exploit availability or observed attack activity is established by these sources.
Researcher notes
The CVE description supports network-reachable command injection, and the vector indicates no authentication or interaction. However, the supplied affected entry—version "0" with a default unaffected status—is insufficient for precise version matching. The bundle provides no vulnerable endpoint, root cause detail, patch version, public exploit evidence, or active-exploitation evidence.
Mitigation direction
- Check Ubiquiti's advisory for affected releases and the approved fixed version.
- Apply the vendor-provided update or mitigation as soon as confirmed applicable.
- Restrict UniFi Protect access to trusted management networks while remediation is pending.
- Reduce unnecessary network reachability to the affected application and host device.
Validation and detection
- Inventory UniFi Protect deployments and record their exact application and platform versions.
- Compare each installed version with Ubiquiti Security Advisory Bulletin 067.
- Verify network controls prevent access from untrusted or unnecessary network segments.
- Review available host and application telemetry for unexplained command execution or configuration changes.
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-2026-77537 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
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:C/C:H/I:H/A:H3.96UbiquitiVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/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.