Citrix NetScaler ADC/Gateway Sensitive Info Disclosure
CVE-2023-4966 Published on October 10, 2023
Unauthenticated sensitive information disclosure
Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtualserver.
Known Exploited Vulnerability
This Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
The following remediation steps are recommended / required by November 8, 2023: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2023-4966 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a Buffer Overflow Vulnerability?
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.
CVE-2023-4966 has been classified to as a Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2023-4966
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-4966 are published in these products:
Affected Versions
Citrix NetScaler ADC:- Version 14.1 and below 8.50 is affected.
- Version 13.1 and below 49.15 is affected.
- Version 13.0 and below 92.19 is affected.
- Version 13.1-FIPS and below 37.164 is affected.
- Version 12.1-FIPS and below 55.300 is affected.
- Version 12.1-NDcPP and below 55.300 is affected.
- Version 14.1 and below 8.50 is affected.
- Version 13.1 and below 49.15 is affected.
- Version 13.0 and below 92.19 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.