CVE-2026-77550

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
No patch confirmed yet.
generic
https://community.ui.com/releases/Security-Advisory-Bulletin-067/fc4a3488-7c43-4628-8bab-f715e96dbfc9

Vendor Advisories for CVE-2026-77550(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 29× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 02:15 UTCEG score recompute
  2. 2026-08-30 02:15 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 21:53 UTCGHSA enrichment
  5. 2026-08-29 17:31 UTCGHSA enrichment
  6. 2026-08-29 13:09 UTCGHSA enrichment
  7. 2026-08-29 08:46 UTCGHSA enrichment
  8. 2026-08-29 04:23 UTCGHSA enrichment
  9. 2026-08-28 23:58 UTCEG score recompute
  10. 2026-08-28 23:58 UTCGHSA enrichment
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 19:06 UTCGHSA enrichment
  13. 2026-08-28 16:05 UTCGHSA enrichment
  14. 2026-08-28 11:40 UTCGHSA enrichment
  15. 2026-08-28 07:18 UTCGHSA enrichment
  16. 2026-08-28 02:51 UTCGHSA enrichment
  17. 2026-08-27 22:28 UTCGHSA enrichment
  18. 2026-08-27 18:07 UTCEG score recompute
  19. 2026-08-27 18:07 UTCGHSA enrichment
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-27 13:10 UTCGHSA enrichment
  22. 2026-08-27 08:48 UTCEG score recompute
  23. 2026-08-27 08:48 UTCGHSA enrichment
  24. 2026-08-27 04:26 UTCEG score recompute
  25. 2026-08-27 04:02 UTCEG score recompute
Show 4 more
  1. 2026-08-26 15:52 UTCEG score recompute
  2. 2026-08-26 12:58 UTCEG score recompute
  3. 2026-08-26 10:48 UTCEG score recompute
  4. 2026-08-26 10:47 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77550?
CVE-2026-77550 is a critical vulnerability published on August 26, 2026. 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.
When was CVE-2026-77550 disclosed?
CVE-2026-77550 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77550 actively exploited?
CVE-2026-77550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.5% of all scored CVEs.
What is the CVSS score of CVE-2026-77550?
CVE-2026-77550 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-77550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77550, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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