Security News > 2023 > July > New critical Citrix ADC and Gateway flaw exploited as zero-day
Citrix today is alerting customers of a critical-severity vulnerability in NetScaler ADC and NetScaler Gateway that already has exploits in the wild, and "Strongly urges" to install updated versions without delay.
Formerly Citrix ADC and Citrix Gateway, the two NetScaler products received new versions today to mitigate a set of three vulnerabilities.
The company notes that NetScaler ADC and NetScaler Gateway version 12.1 have reached the end-of-life stage and customers should upgrade to a newer variant of the product.
In the first week of July, someone advertised on a hacker forum a zero-day vulnerability for Citrix ADC. The details are too few to definitely link it to the Citrix security bulletin today but the little clues available appear to point to it.
The author of the post said on July 6 that they had a remote code execution zero-day that allegedly worked for versions of Citrix ADC up to 13.1 build 48.47.
At the time of writing, technical details about all three vulnerabilities are not publicly available but organizations with NetScaler ADC and Gateway appliances should prioritize updating them.