CVE-2026-21634
A malicious actor with access to the adjacent network could overflow the UniFi Protect...
A malicious actor with access to the adjacent network could overflow the UniFi Protect Application (Version 6.1.79 and earlier) discovery protocol causing it to restart.
Affected Products: UniFi Protect Application (Version 6.1.79 and earlier).
Mitigation: Update your UniFi Protect Application to Version 6.2.72 or later.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
A malicious actor with access to the adjacent network could overflow the UniFi Protect Application (Version 6.1.79 and earlier) discovery protocol causing it to restart.
Affected Products: UniFi Protect Application (Version 6.1.79 and earlier).
Mitigation: Update your UniFi Protect Application to Version 6.2.72 or later.
- Record
CVE-2026-21634- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-119
- Updated
- 2026-11-02
EUVDEUVD-2026-0826
A malicious actor with access to the adjacent network could overflow the UniFi Protect Application (Version 6.1.79 and earlier) discovery protocol causing it to restart.
Affected Products: UniFi Protect Application (Version 6.1.79 and earlier).
Mitigation: Update your UniFi Protect Application to Version 6.2.72 or later.
- Record
EUVD-2026-0826- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-w6v6-cxgj-7xh5
A malicious actor with access to the adjacent network could overflow the UniFi Protect...
A malicious actor with access to the adjacent network could overflow the UniFi Protect Application (Version 6.1.79 and earlier) discovery protocol causing it to restart.
Affected Products: UniFi Protect Application (Version 6.1.79 and earlier).
Mitigation: Update your UniFi Protect Application to Version 6.2.72 or later.
- Record
GHSA-w6v6-cxgj-7xh5- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-119
- Updated
- 2026-11-02
NVD
A malicious actor with access to the adjacent network could overflow the UniFi Protect Application (Version 6.1.79 and earlier) discovery protocol causing it to restart.
Affected Products: UniFi Protect Application (Version 6.1.79 and earlier).
Mitigation: Update your UniFi Protect Application to Version 6.2.72 or later.
- Record
CVE-2026-21634- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-119
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-21634 is a medium vulnerability (CVSS 6.5) in Ubiquiti Inc Unifi Protect Application, published January 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. No source names a fixed version.