CRITICAL CISA KEV

CVE-2025-6543

CVSS v3

9.8

CRITICAL

EPSS Score

10.6 %

exploit probability, as of 2026-10-04

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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

CISA Known Exploited Vulnerability

Date Added: 2025-06-30
Patch Due Date: 2025-07-21
Ransomware Use: Unknown

Technical details

Published: 2025-06-25
Last Modified: 2026-06-17

Frequently asked questions

What is CVE-2025-6543?

Is CVE-2025-6543 actively exploited?

Yes. CVE-2025-6543 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-07-21.

What is the CVSS score for CVE-2025-6543?

CVE-2025-6543 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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