CVEs / CVE-2026-8452
CVE-2026-8452: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
- Known exploited in the CISA KEV catalog since 26 Aug 2026
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 1.01% chance of exploitation in the next 30 days, higher than 63% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to denial of service.
Description
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| NetScaler ADC | from 14.1, before 72.61 | 72.61 |
| NetScaler ADC | from 13.1, before 63.18 | 63.18 |
| NetScaler ADC | from 14.1 FIPS, before 72.61 | 72.61 |
| NetScaler ADC | from 13.1 FIPS and NDcPP, before 37.272 | 37.272 |
| NetScaler Gateway | from 14.1, before 72.61 | 72.61 |
| NetScaler Gateway | from 13.1, before 63.18 | 63.18 |
Exploitation
| In CISA KEV since | 26 Aug 2026 |
|---|---|
| Due date for US federal agencies | 29 Aug 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-119 |
References
- CVE-2026-8452 on NVD
- CVE-2026-8452 in the CISA KEV catalog
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604 (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8452 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.