CVE-2019-25651

Device takeover via recoverable AES-CBC keys

Published Mar 27, 2026 · Updated Mar 27, 2026

Weak device-controller encryption in affected Ubiquiti UniFi releases allows attackers to recover keys and control network devices. The communication protocol encrypts device-management packets with AES-CBC, permitting recovery of a decryption key after enough ciphertext is captured. Unauthenticated attackers need adjacent network access and sufficient traffic; recovered keys enable unauthorized device management and control.

CVSS severity9.0
Critical
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak device-controller encryption in affected Ubiquiti UniFi releases allows attackers to recover keys and control network devices. The communication protocol encrypts device-management packets with AES-CBC, permitting recovery of a decryption key after enough ciphertext is captured. Unauthenticated attackers need adjacent network access and sufficient traffic; recovered keys enable unauthorized device management and control.

The record

CVE
CVE-2019-25651
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
Ubiquiti
Product
UniFi Network Controller
Classifications
CWE-327, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.10.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Ubiquiti · UniFi Network Controllerversion=0 <5.10.12
Ubiquiti · UniFi UAP Firmwareversion=0 <4.0.6
Ubiquiti · UniFi UAP-AC Firmwareversion=0 <3.8.17
Ubiquiti · UniFi USW Firmwareversion=0 <4.0.6
Ubiquiti · UniFi USG Firmwareversion=0 <4.4.34

Published CVSS scores

9.0VulnCheckCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.3VulnCheckCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
8.3UbiquitiCVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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