CVE-2025-12101 Scanner

Citrix NetScaler ADC & Gateway is a popular application delivery and load balancing solution used by enterprises to optimize, secure, and control the delivery of applications and services. It is often deployed in large networks and data centers, facilitating a secure and efficient application delivery experience. Organizations use this product for its advanced traffic management capabilities, ensuring better application availability and scalability. Businesses that rely on Citrix NetScaler ADC & Gateway often include those with high traffic demands and a need for strict security measures. Given its critical role in managing application traffic, this software is an essential component for businesses looking to protect and streamline their online operations.

Cross-Site Scripting (XSS) is a prevalent web security vulnerability that allows attackers to inject malicious scripts into web pages viewed by others. This vulnerability in Citrix NetScaler ADC & Gateway arises when the appliance operates as a Gateway or AAA virtual server. If exploited, it could enable threat actors to execute scripts in the context of the user's browser, leading to potential data theft or hijacking of user sessions. The XSS vulnerability could stem from improper validation of user input, allowing crafted script payloads to be executed. Effective mitigation involves improving input validation and sanitization mechanisms to prevent script injection.

The technical details of this vulnerability involve the injection of a crafted script payload that can be executed within a user's browser session. An endpoint like `/cgi/logout` might be vulnerable if it improperly handles user-supplied data, permitting the insertion of malicious JavaScript. Attackers could exploit this by sending specially crafted requests, resulting in the inadvertent execution of scripts on legitimate users' browsers. Proper handling of HTTP responses and diligent input validation are necessary to remedy such security shortcomings. Affected systems may return a status code of 302, with an XSS payload present in the response.

The potential effects of this vulnerability can be severe, as it opens the door to numerous security issues. Successful exploitation could allow attackers to execute arbitrary scripts, potentially leading to data exfiltration, user session hijacking, or redirection to malicious sites. Sensitive information such as cookies, session tokens, or other session identifiers could be stolen, compromising user security and privacy. Additionally, this could undermine trust in an organization's web infrastructure, crippling users' confidence in accessing its services. To mitigate these risks, prompt patching and robust input validation procedures are essential.

REFERENCES

• https://labs.watchtowr.com/is-it-citrixbleed4-well-no-is-it-good-also-no-citrix-netscalers-memory-leak-rxss-cve-2025-12101/?1