ISAKMP-IKE - VPN DISABLED, UDP PORTS OPEN Subscribe to Security Advisories

Sunday, July 29, 2018
Friday, November 9, 2018

Vulnerability scans of the ACOS management interface have shown ISAKMP/IKE (Internet Security Association and Key Management Protocol/Internet Key Exchange) UDP ports to be open when no IKE-based VPNs were configured for A10 Thunder and AX devices.

This behavior does not represent a security risk or exposure in the ACOS system, as received packets on UDP ports 500, 4500, and 4510 will be ignored in such cases. To avoid false reporting of potential ACOS vulnerabilities in this regard, the behavior will be corrected as described further in this document.

Item # Vulnerability ID Score Source Score Summary
1 Qualys QID: 42017 A10 0.0 Low Remote Access or Management Service Detected

Affected Releases

The table below indicates releases of ACOS potentially affected by these false-positives and ACOS releases that address them. ACOS release families not indicated below are not prone to such reports.

Customers using affected ACOS releases can overcome such false reports by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.

Releases AffectedReleases Resolved or Unaffected

4.1.2 – 4.1.2-P4


4.1.1 – 4.1.1-P9


4.1.0 – 4.1.0-P11


Workarounds and Mitigations 


Software Updates 

Software updates that address these vulnerabilities are or will be published at the following URL:

Vulnerability Details

The following table shares brief descriptions of the vulnerabilities addressed in this document.

Vulnerability IDVulnerability Description

A remote access or remote management service was detected. If such a service is accessible to malicious users it can be used to carry different type of attacks. Malicious users could try to brute force credentials or collect additional information on the service which could enable them in crafting further attacks.

The Results section includes information on the remote access service that was found on the target.

Services like Telnet, Rlogin, SSH, windows remote desktop, pcAnywhere, Citrix Management Console, Remote Admin (RAdmin), VNC, OPENVPN and ISAKMP are checked.

Expose the remote access or remote management services only to the system administrators or intended users of the system.

Service name: ISAKMP on UDP port 500.



Modification History 
July 29, 2018

Initial Publication

November 09, 2018

Updated affected and resolved release information for ACOS 4.1.1 release family.