What is the CVSS score of CVE-2025-7775?

CVE-2025-7775 has a CVSS 4.0 base score of 9.2 (Critical). CVSS vector: 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. EPSS exploitation probability: 6.6%.

Is CVE-2025-7775 being actively exploited?

Yes, CVE-2025-7775 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

How to fix or mitigate CVE-2025-7775?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Monitor vendor channels for patch availability.

Netscaler Gateway CVE-2025-7775

CRITICAL

Buffer Overflow (CWE-119)

2025-08-26 secure@citrix.com

RCE Buffer Overflow Denial Of Service Citrix Netscaler Application Delivery Controller Netscaler Gateway

9.2

CVSS 4.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	Critical risk (CVSS 9.2). The broad range of affected configurations means almost every NetScaler deployment is vulnerable. This continues the pattern of critical NetScaler vulnerabilities in 2023-2026.
Exploit ScenarioDerived	An attacker sends crafted requests to a NetScaler appliance configured as a VPN gateway. The memory overflow achieves code execution, providing access to VPN credentials and the ability to intercept all VPN traffic.

Act Now Prioritize within 24-48h. Why: CRITICAL + in CISA KEV (actively exploited), no patch available.

Exploited in the wild (CISA KEV) No patch listed yet 6.6% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Citrix NetScaler ADC and Gateway contain a memory overflow vulnerability enabling remote code execution and denial of service when configured as VPN, AAA, or load balancing virtual servers.

Earlier versions of this analysis (1)

v1 Mar 28, 2026 - 19:08 CVSS 9.2

A critical memory overflow in NetScaler ADC and Gateway enables RCE and DoS across multiple configuration modes including VPN, AAA, and load balancing.

RemediationAI

Apply Citrix patches immediately. Monitor for exploitation indicators. Consider the ongoing pattern of NetScaler vulnerabilities when evaluating platform risk.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The CWE-119 memory overflow in NetScaler's request processing affects devices configured as Gateway (VPN, ICA Proxy, CVPN, RDP Proxy), AAA virtual server, or load balancer, covering virtually all deployment scenarios.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Attack Requirements

Present

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

Low

Subsequent system: Integrity

Low

Subsequent system: Availability

Low

Lifecycle Timeline

Added to CISA KEV

Oct 24, 2025 - 13:42 cisa

CISA KEV

CVE Published

Aug 26, 2025 - 13:15 nvd

CRITICAL 9.2

DescriptionCVE.org

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

Executive ViewAI

Why It Matters

CVE-2025-7775 presents critical security risk, a buffer overflow vulnerability rated CVSS 9.2. Exploitation could allow attackers to corrupt memory, crash the application, or potentially execute arbitrary code. This vulnerability is actively exploited in the wild (KEV-listed) and requires immediate remediation. Immediate patching is required per CISA KEV mandate.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score

6.6%

Top 9% exploitable

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV Yes

Public POC No

EPSS 6.6%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + in CISA KEV (actively exploited), no patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Human Impact

Very High

Priority Score

103

Low Medium High Critical

KEV: +50

EPSS: +7

CVSS: +46

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*

cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*

cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*

cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*

cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*

cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*

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Same weakness CWE-119 – Buffer Overflow

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References

Advisories & patches

ADVISORY https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-7775

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