CVE-2021-22957Network attack vector

Privileged account takeover via permissive CORS

Published Nov 24, 2021 · Updated Aug 3, 2024

Cross-origin resource sharing in Ubiquiti UniFi Protect 1.19.2 and earlier allows remote attackers to take over a privileged account. Ubiquiti has not disclosed which Protect endpoint returns permissive CORS headers or how the malicious origin gains the account context. Exploitation requires a privileged user to visit an attacker-controlled URL, after which the attacker gains control of that user's Protect account.

CVSS severity7.5
High
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-origin resource sharing in Ubiquiti UniFi Protect 1.19.2 and earlier allows remote attackers to take over a privileged account. Ubiquiti has not disclosed which Protect endpoint returns permissive CORS headers or how the malicious origin gains the account context. Exploitation requires a privileged user to visit an attacker-controlled URL, after which the attacker gains control of that user's Protect account.

The record

CVE
CVE-2021-22957
Published
Nov 24, 2021
Updated
Aug 3, 2024
Vendor
Ubiquiti Inc.
Product
UniFi Protect
Classifications
CWE-16, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=Fixed in 1.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ubiquiti Inc. · UniFi Protectversion=Fixed in 1.20.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5Ubiquiti Inc.CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-16Configuration
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo