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Citrix Warns of Active Exploits on NetScaler Zero-Day Vulnerability

June 26, 2025

CVE-2025-6543 – Citrix NetScaler ADC and NetScaler Gateway Vulnerability

Severity

High

Analysis Summary

CVE-2025-6543

Citrix NetScaler ADC and NetScaler Gateway is vulnerable to a buffer overflow, leading to unintended control flow and denial of service.

Impact

  • Denial of Service
  • Buffer Overflow

Indicators of Compromise

CVE

  • CVE-2025-6543

Affected Vendors

  • Citrix

Affected Products

  • Citrix NetScaler ADC 13.1
  • Citrix NetScaler Gateway 13.1
  • Citrix NetScaler ADC 14.1
  • Citrix NetScaler ADC 13.1 FIPS and NDcPP
  • Citrix NetScaler Gateway 14.1
  • Citrix NetScaler Gateway 13.1 FIPS and NDcPP

Remediation

Refer to Citrix Security Advisory for patch, upgrade, or suggested workaround information.

Citrix Security Advisory

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