What is CVE-2025-7775?

CVE-2025-7775 is a critical-severity vulnerability in Citrix Netscaler Application Delivery Controller, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2025-08-26.

How severe is CVE-2025-7775?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-7775 known to be exploited?

Yes. CVE-2025-7775 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-08-26), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.

Buffer overflow in Citrix Netscaler Application Delivery Controller

CVE-2025-7775

Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX

Vulnerability class: Buffer Overflow

EPSS: 0.196 (97.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Citrix Netscaler_application_delivery_controller
Citrix Netscaler_gateway
Netscaler Adc — versions 14.1, 13.1, 13.1 FIPS and NDcPP
Netscaler Gateway — versions 14.1, 13.1, 13.1 FIPS and NDcPP

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-08-26. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-08-28.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

secure@citrix.com (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2025-7775?: CVE-2025-7775 is a critical-severity vulnerability in Citrix Netscaler Application Delivery Controller, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2025-08-26.
How severe is CVE-2025-7775?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-7775 known to be exploited?: Yes. CVE-2025-7775 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-08-26), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.