---
title: "CVE-2025-7775: Citrix NetScaler Memory Overflow Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-7775/
description: "CVE-2025-7775 (Citrix NetScaler): Exploited in the wild (CISA KEV). Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-08-26
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-7775"
kev: true
cvss: 9.2
epss: 0.20284
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-7775: Citrix NetScaler Memory Overflow Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Citrix NetScaler. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-08-26, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-08-28 ; treat that as the outer limit, not the target.
- EPSS 20.3% , percentile 97: FIRST’s model estimates a 20.3% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## 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 HTTPQUIC) 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 HTTPQUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX

## Affected products (CVE record)

- NetScaler ADC: 14.1 < 47.48, 13.1 < 59.22, 13.1 FIPS and NDcPP < 37.241, 12.1 FIPS and NDcPP < 55.330
- NetScaler Gateway: 14.1 < 47.48, 13.1 < 59.22, 13.1 FIPS and NDcPP < 37.241, 12.1 FIPS and NDcPP < 55.330

## Severity

- Citrix CVSS 4.0: 9.2 `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`

## Exploitation

- CISA KEV: added 2025-08-26; federal due date 2025-08-28. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 20.28% probability of exploitation activity in the next 30 days; percentile 97.

## Sources

- [Listed in CISA KEV notes (support.citrix.com)](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938)
- [CVE.org record CVE-2025-7775](https://www.cve.org/CVERecord?id=CVE-2025-7775)
- [NVD entry CVE-2025-7775](https://nvd.nist.gov/vuln/detail/CVE-2025-7775)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-7775)

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Source page: https://erroneo.us/security/cve/CVE-2025-7775/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt