Full Report
The bug enables threat actors to send requests that disclose sensitive information and carries a severity score of 9.3 out of 10, indicating a critical risk.
Analysis Summary
# Vulnerability: Critical Information Disclosure in Citrix NetScaler ADC and Gateway
## CVE Details
- **CVE ID:** CVE-2026-3055
- **CVSS Score:** 9.3 (Critical)
- **CWE:** Not specifically listed (Information Disclosure / Sensitive Memory Leak)
## Affected Systems
- **Products:** Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway.
- **Versions:** Specific vulnerable versions are not itemized in the article, but the flaw impacts customers managing their own (on-premises) appliances.
- **Configurations:** Systems configured as authentication gateways or traffic managers for enterprise environments.
## Vulnerability Description
CVE-2026-3055 is a critical information disclosure vulnerability. It allows an unauthenticated attacker to send crafted requests to the NetScaler Gateway to leak and read sensitive data from the appliance's memory. Security researchers have noted that the flaw shares characteristics with previous "Citrix Bleed" vulnerabilities, which allowed attackers to bypass session authentication by stealing session tokens directly from memory.
## Exploitation
- **Status:** **Exploited in the wild.** CISA has added this to the Known Exploited Vulnerabilities (KEV) catalog.
- **Complexity:** Low (Unauthenticated access)
- **Attack Vector:** Network
## Impact
- **Confidentiality:** High (Ability to read sensitive memory and potentially hijack sessions)
- **Integrity:** Medium/High (Indirect impact: leaked tokens can lead to full environment access)
- **Availability:** Low
## Remediation
### Patches
Citrix released security updates and patches on March 23, 2026. Organizations should update to the latest firmware versions provided in the Citrix security bulletin.
- Relevant Advisory: hxxps[://]support[.]citrix[.]com/article/CTX696300
### Workarounds
- No specific software workarounds were provided in the article; immediate patching is the mandated course of action by CISA.
- Federal agencies are required to remediate by the deadline of Thursday, April 2, 2026.
## Detection
- **Indicators of Compromise:** Monitor for unusual or malformed HTTP requests directed at the NetScaler Gateway.
- **Detection methods and tools:** Organizations should review logs for unauthorized access patterns or memory-leak-style request signatures. Security firm watchTowr is actively monitoring and reporting on exploitation trends.
## References
- CISA KEV Catalog: hxxps[://]www[.]cisa[.]gov/known-exploited-vulnerabilities-catalog
- Citrix Security Bulletin: hxxps[://]support[.]citrix[.]com/support-home/kbsearch/article?articleNumber=CTX696300
- Citrix Community Blog: hxxps[://]community[.]citrix[.]com/techzone-blogs/110_security-updates/critical-and-high-severity-updates-announced-for-netscaler-gateway-and-netscaler-adc-r1256/