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CVE-2025-6543

Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

Citrix NetScaler ADC and GatewayNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.2Critical
ExploitationExploited in the wildAdded to KEV 30 Jun 2025CISA KEV
Exploit odds (EPSS)10.6%Chance of exploitation activity in the next 30 days, higher than 95% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in47.46Also 59.19, 37.236CVE List
Federal deadline21 Jul 2025Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 25 Jun 2025, 12:49 UTCPublishedCVE List
  2. 30 Jun 2025Added to CISA KEVCISA KEV

Description

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.

Text from CVE List

Affected versions 6

  • ADCaffected: 14.1 before 47.46CVE List
  • ADCaffected: 13.1 before 59.19CVE List
  • ADCaffected: 13.1 FIPS and NDcPP before 37.236CVE List
  • Gatewayaffected: 14.1 before 47.46CVE List
  • Gatewayaffected: 13.1 before 59.19CVE List
  • Gatewayaffected: 13.1 FIPS and NDcPP before 37.236CVE List

References 4