Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2025-6543

CVE-2025-6543CRITICAL

NetScaler ADC — Memory overflow vulnerability leading to unintended control flow and Denial of Service

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   H   P   N   N   H   H   H    9.2   .1056   95.7   YES

AFFECTED
  Product  Versions  Fixed
  ADC      14.1 –    —
  Gateway  14.1 –    —

TIMELINE
  Jun 23  Reserved by Citrix
  Jun 25  Published (CNA: Citrix)
  Jun 30  Added to CISA KEV, remediation due 2025-07-21

CWE-119 · CNA: Citrix · CVSS v4.0 · 2 references · KEV due July 21, 2025

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 23, 2025	Reserved	Reserved by Citrix
June 25, 2025	Published	Published (CNA: Citrix)
June 30, 2025	KEV ADDED	Added to CISA KEV, remediation due 2025-07-21

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
NetScaler	ADC	—	14.1	—
NetScaler	Gateway	—	14.1	—

Weaknesses

CWE-119

References (2)

Authoritative record: CVE-2025-6543 at cve.org

Vendors: netscaler

Weaknesses: CWE-119

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-6543 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.