Ubiquiti
UniFi OS Server
Ubiquiti UniFi OS Server releases
5.1.42
- Release date
- September 10, 2026
- Security status
- 7 high-severity CVEs tracked in the last 90 days. Current version not affected.
Source
Vendor Release Information
Public release notes are linked for the latest stored release.
Release history
See the latest published releases stored for this product.
| Version | Published | Notes |
|---|---|---|
| 5.1.42 | 2026-09-10 | Release Notes |
| 5.1.40 | 2026-09-02 | Release Notes |
| 5.1.37 | 2026-08-20 | Release Notes |
| 5.1.21 | 2026-07-08 | Release Notes |
| 5.1.19 | 2026-06-18 | Release Notes |
| 5.1.15 | 2026-05-29 | Release Notes |
| 5.0.8 | 2026-05-20 | Release Notes |
| 5.0.6 | 2025-12-11 | Release Notes |
Vulnerability tracking
versionPing monitors CVEs for this product. Matching CVEs are listed below. We only display CVEs with a CVSS score of 7.0 or higher that were published within the last 90 days.
Affected status is inferred from published affected version ranges where available. Always verify against the vendor advisory before making production decisions.
| CVE | Severity | Published | Status | Summary |
|---|---|---|---|---|
| CVE-2026-77550 | CRITICAL (10.0) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network could exploit an Improper Neutralization of CRLF Sequences vulnerability found in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances. Affected versions
|
| CVE-2026-77549 | CRITICAL (9.0) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network and under certain conditions could exploit an Improper Neutralization of CRLF Sequences vulnerability found in certain devices running UniFi OS to bypass authentication to such UniFi OS devices or instances. Affected versions
|
| CVE-2026-77545 | CRITICAL (9.0) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network, low privileges and under certain conditions could exploit an Active Debug Code vulnerability found in certain devices running UniFi OS to escalate privileges within such UniFi OS devices or instances. Affected versions
|
| CVE-2026-77540 | CRITICAL (9.1) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS Server to execute a Command Injection on the host device. Affected versions
|
| CVE-2026-77539 | CRITICAL (9.1) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS Server to execute a Command Injection on the host device. Affected versions
|
| CVE-2026-77536 | CRITICAL (9.9) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network and low privileges could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to escalate privileges within such UniFi OS devices or instances. Affected versions
|
| CVE-2026-77534 | CRITICAL (9.9) | 2026-08-26 | Current versionnot affected | A malicious actor with access to the network and low privileges could exploit an Improper Access Control vulnerability found in certain devices running UniFi OS to escalate privileges within such UniFi OS devices or instances. Affected versions
|