---
cve: "CVE-2019-25651"
severity: "CRITICAL"
cvss: 9.0
epss: "0.1%"
vendor: "Ubiquiti"
kev: false
exploited: false
published: "2026-03-27 22:16:19"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-23T16:42:55+02:00"
---

# CVE-2019-25651

> 9.0 CRITICAL

## Beschreibung

Ubiquiti UniFi Network Controller prior to 5.10.12 (excluding 5.6.42), UAP FW prior to 4.0.6, UAP-AC, UAP-AC v2, and UAP-AC Outdoor FW prior to 3.8.17, USW FW prior to 4.0.6, USG FW prior to 4.4.34 uses AES-CBC encryption for device-to-controller communication, which contains cryptographic weaknesses that allow attackers to recover encryption keys from captured traffic. Attackers with adjacent network access can capture sufficient encrypted traffic and exploit AES-CBC mode vulnerabilities to derive the encryption keys, enabling unauthorized control and management of network devices.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-07-15 01:24:05
- CNA-CVSS: **9.0** (`CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-327** — Use of a Broken or Risky Cryptographic Algorithm
  The product uses a broken or risky cryptographic algorithm or protocol.

## Angriffsmuster (CAPEC)

- [CAPEC-20 — Encryption Brute Forcing](https://capec.mitre.org/data/definitions/20.html) _(Severity: Low)_
- [CAPEC-97 — Cryptanalysis](https://capec.mitre.org/data/definitions/97.html) _(Severity: Very High)_
- [CAPEC-459 — Creating a Rogue Certification Authority Certificate](https://capec.mitre.org/data/definitions/459.html) _(Severity: Very High)_
- [CAPEC-473 — Signature Spoof](https://capec.mitre.org/data/definitions/473.html)
- [CAPEC-475 — Signature Spoofing by Improper Validation](https://capec.mitre.org/data/definitions/475.html) _(Severity: High)_
- [CAPEC-608 — Cryptanalysis of Cellular Encryption](https://capec.mitre.org/data/definitions/608.html) _(Severity: High)_
- [CAPEC-614 — Rooting SIM Cards](https://capec.mitre.org/data/definitions/614.html) _(Severity: High)_

## ATT&CK-Techniken

- [T1036.001 — Masquerading: Invalid Code Signature](https://attack.mitre.org/techniques/T1036/001/)
- [T1553.002 — Subvert Trust Controls: Code Signing](https://attack.mitre.org/techniques/T1553/002/)

## Referenzen

- <https://community.ui.com/releases/Security-Advisory-Bulletin-004-004/462e561b-9efd-4c23-bfa7-53d59cc64ecb>
- <https://www.vulncheck.com/advisories/ubiquiti-unifi-devices-use-of-aes-cbc-allows-key-recovery-and-unauthorized-device-control>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2019-25651/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_