CVE-2025-6543
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
—
EPSS — probability of exploitation (30 days)
10.1%
95.4th percentile
CISA KEV
Listed
Added 2025-06-30 · patch by 2025-07-21
Weakness / dates
—
Published — · modified —
Timeline
- 2025-06-30 — Added to CISA KEV (actively exploited)
- 2025-07-21 — CISA patch-by deadline
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.