Ubiquiti airMAX AC/airMAX M/airFiber AF60-XG/airFiber AF60 airMAX Wireless Protocol command injection

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Ubiquiti airMAX AC, airMAX M, airFiber AF60-XG and airFiber AF60. This vulnerability affects unknown code of the component airMAX Wireless Protocol. The manipulation leads to Remote Privilege Escalation. This vulnerability is referenced as CVE-2026-21639. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Ubiquiti airMAX AC, airMAX M, airFiber AF60-XG and airFiber AF60 (affected version unknown). It has been rated as critical. This issue affects an unknown functionality of the component airMAX Wireless Protocol. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product. Affected Products: airMAX AC (Version 8.7.20 and earlier) airMAX M (Version 6.3.22 and earlier) airFiber AF60-XG (Version 1.2.2 and earlier) airFiber AF60 (Version 2.6.7 and earlier) Mitigation: Update your airMAX AC to Version 8.7.21 or later. Update your airMAX M to Version 6.3.24 or later. Update your airFiber AF60-XG to Version 1.2.3 or later. Update your airFiber AF60 to Version 2.6.8 or later.

The advisory is shared at community.ui.com. The identification of this vulnerability is CVE-2026-21639 since 01/01/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at community.ui.com.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Command injection
CWE: CWE-77 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: community.ui.com

Timelineinfo

01/01/2026 CVE reserved
01/08/2026 +7 days Advisory disclosed
01/08/2026 +0 days VulDB entry created
01/09/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: community.ui.com
Status: Confirmed

CVE: CVE-2026-21639 (🔒)
GCVE (CVE): GCVE-0-2026-21639
GCVE (VulDB): GCVE-100-340145

Entryinfo

Created: 01/08/2026 19:00
Updated: 01/09/2026 19:55
Changes: 01/08/2026 19:00 (52), 01/09/2026 19:55 (2)
Complete: 🔍
Cache ID: 216::103

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