---
title: "CVE-2026-8452: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-8452/
description: "CVE-2026-8452 (Citrix NetScaler ADC and NetScaler Gateway): Exploited in the wild (CISA KEV). Memory overflow vulnerability NetScaler ADC and NetScaler…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-30
date_modified: 2026-08-27
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-8452"
kev: true
cvss: 8.8
epss: 0.01011
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-8452: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer 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 ADC and NetScaler Gateway. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-08-26, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-08-29 ; treat that as the outer limit, not the target.
- EPSS 1.0% , percentile 63: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 63% of all scored CVEs (moderate). 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.
- Editorial verdict: Act now. NetScaler CVE-2026-8452: DoS Bug Exploited as Pre-Auth RCE — Any NetScaler configured as a Gateway or AAA server that is still below the June 30 builds needs patching today and a check for web shells; the bug the vendor called DoS is a public pre-auth RCE under attack.

## What it is

Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server

## Affected products (CVE record)

- NetScaler ADC: 14.1 < 72.61, 13.1 < 63.18, 14.1 FIPS < 72.61, 13.1 FIPS and NDcPP < 37.272
- NetScaler Gateway: 14.1 < 72.61, 13.1 < 63.18

## Severity

- NetScaler CVSS 4.0: 8.8 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L`

## Exploitation

- CISA KEV: added 2026-08-26; federal due date 2026-08-29. Known ransomware use: Unknown.
- CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 1.01% probability of exploitation activity in the next 30 days; percentile 63.

## Sources

- [Listed in CISA KEV notes (support.citrix.com)](https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604)
- [CVE.org record CVE-2026-8452](https://www.cve.org/CVERecord?id=CVE-2026-8452)
- [NVD entry CVE-2026-8452](https://nvd.nist.gov/vuln/detail/CVE-2026-8452)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8452)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)

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Source page: https://erroneo.us/security/cve/CVE-2026-8452/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt