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5.9

Citrix NetScaler ADC and Gateway expose client TLS data

CVE-2017-17549 · published 8 years ago
Summary

Certain older versions of Citrix NetScaler Application Delivery Controller and NetScaler Gateway can let a remote attacker see sensitive information exchanged during the client side of a TLS connection when client certificates and a specific key exchange method are used. This could reveal details about the client’s authentication process. Updating the devices to the latest firmware releases removes the exposure.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
citrix application_delivery_controller_firmware 10.5
11.0
11.1
12.0
cpe:2.3:o:citrix:application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*
citrix netscaler_gateway_firmware 10.5
11.0
11.1
12.0
cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*
Original advisory text
Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote atta...
Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 10.5 before build 67.13, 11.0 before build 71.22, 11.1 before build 56.19, and 12.0 before build 53.22 allow remote attackers to obtain sensitive information from the backend client TLS handshake by leveraging use of TLS with Client Certificates and a Diffie-Hellman Ephemeral (DHE) key exchange.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.9 Medium
Exploitation
2% chance of attack within 30 days
Type
CWE-200Information Exposure
Timeline
Published13 Dec 2017
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2017-17549 · NVD
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