Full Report
Citrix security advisory (AV26-833)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in NetScaler ADC and NetScaler Gateway
## CVE Details
*Note: Based on the provided advisory (AV26-833), two specific vulnerabilities are identified.*
**Vulnerability 1:**
- CVE ID: CVE-2026-19489
- CVSS Score: Not explicitly provided in the summary text (typically high for NetScaler security flaws)
- CWE: Information Disclosure / Security Bypass (Pending technical deep-dive)
**Vulnerability 2:**
- CVE ID: CVE-2026-19490
- CVSS Score: Not explicitly provided in the summary text
- CWE: Denial of Service or Unauthorized Access (Pending technical deep-dive)
## Affected Systems
- **Products:** NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway.
- **Versions:**
- NetScaler ADC and NetScaler: Version 13.1 (up to and including 13.1-63.21)
- NetScaler ADC and NetScaler: Version 14.1 (up to and including 14.1-73.32)
- NetScaler ADC FIPS: Versions prior to 14.1-73.32 FIPS
- NetScaler ADC FIPS and NDcPP: Versions prior to 13.1-37.277
## Vulnerability Description
While the specific technical primitives (e.g., buffer overflow, logic flaw) are detailed in the internal Citrix KB article CTX696939, these vulnerabilities typically involve weaknesses in the management interface or the processing of specific network packets handled by the NetScaler ADC/Gateway appliances. Historically, flaws in these products often relate to unauthorized access to sensitive information or the ability to bypass security controls.
## Exploitation
- **Status:** Not explicitly stated as exploited in the wild in this bulletin; however, Citrix NetScaler vulnerabilities are high-value targets for threat actors.
- **Complexity:** Medium to Low (Typical for ADC vulnerabilities).
- **Attack Vector:** Network (Likely remote exploitation via the management interface or public-facing gateway).
## Impact
- **Confidentiality:** Potential High (depending on the specific CVE).
- **Integrity:** Potential High.
- **Availability:** Potential High.
## Remediation
### Patches
Citrix recommends upgrading to the following versions or higher to mitigate these risks:
- **NetScaler ADC and NetScaler Gateway:** Upgrade to versions newer than 13.1-63.21 or 14.1-73.32.
- **NetScaler ADC FIPS:** Upgrade to version 14.1-73.32 FIPS or higher.
- **NetScaler ADC FIPS and NDcPP:** Upgrade to version 13.1-37.277 or higher.
### Workarounds
- Limit access to the NetScaler Management Interface (NSIP) to trusted internal networks only.
- Ensure robust firewalling is in place for the management IP and Subnet IP (SNIP).
## Detection
- **Indicators of Compromise:** Monitor system logs for unusual administrative logins or crashes of the `nspappe` process.
- **Detection methods and tools:** Utilize vulnerability scanners (e.g., Nessus, Qualys) updated with the latest plugins for CVE-2026-19489 and CVE-2026-19490. Review NetScaler audit logs for unauthorized configuration changes.
## References
- Citrix Security Bulletin (CTX696939): hxxps[://]support[.]citrix[.]com/support-home/kbsearch/article?articleNumber=CTX696939
- Citrix Security Advisories Portal: hxxps[://]support[.]citrix[.]com/support-home/topic-article-list?trendingCategory=20&trendingTopicName=Security%20Bulletin
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/citrix-security-advisory-av26-833