Which products and versions are affected by CVE-2025-6543?

Affected: Netscaler Application Delivery Controller (Citrix) versions >= 14.1; Netscaler Gateway (Citrix) versions >= 14.1. The full list is in the CVE brief.

Is CVE-2025-6543 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 25, 2025.

Is CVE-2025-6543 in the CISA KEV catalog?

Yes. It was added on Jun 30, 2025 with a federal remediation due date of Jul 21, 2025.

Is there a public exploit for CVE-2025-6543?

Public exploit code is available.

Is there a fix for CVE-2025-6543?

Fixed versions are available, including Netscaler Application Delivery Controller 37.236, Netscaler Application Delivery Controller 47.46, Netscaler Application Delivery Controller 59.19.

How urgently should CVE-2025-6543 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2025-6543

CriticalExploitedPublic exploit

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

Published Jun 25, 2025 · Updated Feb 26, 2026

Key Facts

Patch immediately

CVE-2025-6543 is a critical-severity vulnerability (CVSS 9.2 v4) affecting Netscaler Application Delivery Controller (Citrix), Netscaler Gateway (Citrix).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 25, 2025. Public exploit code is available.
EPSS estimates a 11% probability of exploitation in the next 30 days.
Fixed versions are available, including Netscaler Application Delivery Controller 37.236, Netscaler Application Delivery Controller 47.46, Netscaler Application Delivery Controller 59.19.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v4

9.2

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

EPSS (30-day exploit likelihood)

11%

Higher than 95.7% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-6543 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Jun 30, 2025	Jul 21, 2025	Not reported
Industry KEV feed	Jun 25, 2025	Jul 21, 2025	Not reported
CIRCL KEV	Jun 30, 2025	Jul 21, 2025	Not reported
ENISA EUVD	Jun 30, 2025	n/a	Not reported

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

Affected Products

6 affected entries in total

Product	Affected versions	Fixed in
Netscaler Application Delivery ControllerCitrix	>= 14.1	13.1-59.19
Netscaler GatewayCitrix	>= 14.1	13.1-59.19

Patched Releases

Netscaler Application Delivery Controller

37.236, 47.46, 59.19, 13.1-37.236, 13.1-59.19

Netscaler Gateway

13.1-59.19, 37.236, 47.46, 59.19

Timeline

Publicly disclosed
Jun 25, 2025
Added to Industry KEV feed
Jun 25, 2025
Added to CISA KEV
Jun 30, 2025
Added to CIRCL KEV
Jun 30, 2025
Added to ENISA EUVD
Jun 30, 2025
Last updated
Feb 26, 2026

Weakness Type

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

References

6 more references in the full CVE brief

FAQ

Common Questions.

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
Affected: Netscaler Application Delivery Controller (Citrix) versions >= 14.1; Netscaler Gateway (Citrix) versions >= 14.1. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 25, 2025.
Yes. It was added on Jun 30, 2025 with a federal remediation due date of Jul 21, 2025.
Public exploit code is available.
Fixed versions are available, including Netscaler Application Delivery Controller 37.236, Netscaler Application Delivery Controller 47.46, Netscaler Application Delivery Controller 59.19.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2025-6543 Running On Your Attack Surface?

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