CVE-2026-77550A malicious actor with access to the network could exploit an Improper Neutralization of CRLF Sequences vulnerability found in certain…
- 10.0CriticalCVSS base score
- 0.80%Exploitation in 30 daysEPSS · top 43% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Ubiquiti
- 6 days later
· 6 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| UbiquitiCNA (assigner) | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.80% · top 43% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 10.0.
Affected products
Ubiquiti Inc · UniFi OS Server
- affected < 5.1.37
- affected < 5.1.31
Ubiquiti Inc · Network Video Recorders
- affected < 5.1.31
Ubiquiti Inc · Enterprise Network Video Recorders
- affected < 5.1.31
Ubiquiti Inc · Enterprise Network Attached Storage
- affected < 5.1.31
- affected < 5.1.31
Ubiquiti Inc · Enterprise Firewall Core
- affected < 5.1.31
- affected < 5.1.31
Ubiquiti Inc · Enterprise Fortress Gateway
- affected < 5.1.31
- affected < 5.1.31
- affected < 5.1.31
- affected < 5.1.31
Ubiquiti Inc · Network Attached Storage
- affected < 5.1.32
- affected < 4.0.17
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-66399 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-77550)Record last updated .