9.8

CVE-2025-6543

Warning
Media report

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

Data is provided by the National Vulnerability Database (NVD)
Citrix ≫ Netscaler Application Delivery Controller SwEditionfips Version >= 13.1 < 13.1-37.236
Citrix ≫ Netscaler Application Delivery Controller SwEditionndcpp Version >= 13.1 < 13.1-37.236
Citrix ≫ Netscaler Application Delivery Controller SwEdition- Version >= 13.1 < 13.1-59.19
Citrix ≫ Netscaler Application Delivery Controller SwEdition- Version >= 14.1 < 14.1-47.46
Citrix ≫ NetScaler Gateway Version >= 13.1 < 13.1-59.19
Citrix ≫ NetScaler Gateway Version >= 14.1 < 14.1-47.46

30.06.2025: CISA Known Exploited Vulnerabilities (KEV) Catalog

Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

Vulnerability

Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

Description

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Required actions
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 1.23% 0.785
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
secure@citrix.com 9.2 0 0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.