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Security advisories — Jan 27, 2020

UPDATE - Citrix Releases Critical Security Patches

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The Threat:

UPDATE: As of January 24th, 2020, Citrix has released security patches for all affected versions of Citrix ADC, SD-WAN WANOP, and Citrix Gateway products [1]. There has been confirmed exploitation of this vulnerability by at least one prominent ransomware threat actor group [2]. Due to the widespread exploitation of this vulnerability it is highly recommended that organizations apply security patches for all affected Citrix products as soon as possible. After security patches are applied, the previously recommended mitigation actions are no longer required; however, eSentire suggests running the Citrix/FireEye tool to verify that a previous compromise has not occurred.

On January 19th, 2020, Citrix released patches for two vulnerable versions of Citrix ADC and Citrix Gateway products [1]. These patches address the critical code execution vulnerability reported in previous advisories [3]. This vulnerability is being actively exploited in the wild for multiple malicious purposes; it is highly recommended to apply the available patches as soon as possible.

What we’re doing about it:

What you should do about it:

Additional information:

CVE-2019-19781 allows simple directory traversal by a remote attacker in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. Additionally, the vulnerability affects the Citrix SD-WAN WANOP appliance, versions 10.2.6 and 11.0.3.

It should be noted that the mitigation actions supplied by Citrix do not work on Citrix ADC and Citrix Gateway Release "12.1 build 50.28". If running this build, users will need update to version 12.1 build 50.28/50.31 or later. 

Patch Release [1]

Citrix ADC Version

Patch Release Date


Jan 23, 2020 


Jan 23, 2020 


Jan 19, 2020 


Jan 19, 2020 


Jan 24, 2020 


Patch Release Date


Jan 22, 2020 


Jan 22, 2020 


[1] https://support.citrix.com/art...

[2] https://www.zdnet.com/article/...

[3] https://www.esentire.com/secur...

[4] https://www.fireeye.com/blog/p...

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