# CVE-2019-25651: Ubiquiti UniFi Devices Use of AES-CBC Allows Key Recovery and Unauthorized Device Control

> Attackers with adjacent network access can recover encryption keys from captured traffic due to weak AES-CBC usage, enabling unauthorized control of Ubiquiti UniFi network devices.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2026
- **Updated:** 15 Jul 2026
- **Also known as:** GHSA-m2rv-r87h-2v59

## What is CVE-2019-25651?

CVE-2019-25651 is a critical vulnerability in Ubiquiti UniFi Network Controller, published on 27 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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.

Weakness: CWE-327 (Use of a Broken or Risky Cryptographic Algorithm)

## Which versions are affected by CVE-2019-25651?


## How do I fix CVE-2019-25651?

No fix has been published for CVE-2019-25651 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-25651 being exploited?

There is no known exploitation of CVE-2019-25651 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25651 and fix it if it is affected.

What it is: CVE-2019-25651 is a critical vulnerability in Ubiquiti UniFi Network Controller, published on 27 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-25651 in the wild and no public exploit code.

Affected product: Ubiquiti UniFi Network Controller. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-25651/ (Markdown: https://insights.sbomify.com/CVE-2019-25651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25651
- OSV: https://osv.dev/vulnerability/CVE-2019-25651

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-25651/
Summaries are generated and may contain mistakes; the official description above is the record.