CVE-2025-6543

CRITICAL CISA KEV EPSS 94.9%
Published Jun 25, 20251y ago · Modified Jun 17, 20261w ago
9.2 CVSS 4.0
Critical
Find Similar
Published Jun 25, 2025 1y ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Jun 30, 2025 1y ago
KEV Due Jul 21, 2025 344d overdue

Description

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

CVSS Details

Base Score
9.2
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

CISA Known Exploited Overdue 344d
Added
Jun 30, 2025
Due
Jul 21, 2025

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

EPSS Exploit Probability
94.9% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available

Weaknesses 1

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer Memory Safety

Affected Products 6

VendorProductVersionRange
citrixnetscaler_application_delivery_controller*≥13.1  –  <13.1-37.236
citrixnetscaler_application_delivery_controller*≥13.1  –  <13.1-37.236
citrixnetscaler_application_delivery_controller*≥13.1  –  <13.1-59.19
citrixnetscaler_application_delivery_controller*≥14.1  –  <14.1-47.46
citrixnetscaler_gateway*≥13.1  –  <13.1-59.19
citrixnetscaler_gateway*≥14.1  –  <14.1-47.46

References 2

  • support.citrix.com https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788
    Vendor Advisory
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6543
    US Government Resource

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.