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Known exploited vulnerability

CVE-2025-7775

criticalCVSS 4.0 9.2In CISA KEVEPSS 21%Published · NetScaler

The short answer

CVE-2025-7775 affects NetScaler ADC and is rated critical (CVSS 9.2). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-08-26: attackers are using it, so patch it first.

What it is

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

Weakness: CWE-119.

Severity

9.2 critical

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploited (CISA KEV)

Yes, since Aug 26, 2025

Federal due date Aug 28, 2025

EPSS, next 30 days

21%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Attack requirements
Present
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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

Affected products

ADC, Gateway. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2025-7775 being exploited?

Yes. CISA added CVE-2025-7775 to its Known Exploited Vulnerabilities catalog on 2025-08-26, with a federal remediation due date of 2025-08-28.

How do I fix CVE-2025-7775?

CISA's 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.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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