CVE-2026-8452: Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- Improper restriction of operations within memory buffer bounds in Citrix NetScaler leading to denial of service.
- Who is affected
- Citrix NetScaler ADC and NetScaler Gateway deployments.
- Urgency
- Critical; actively exploited and affects critical infrastructure appliances.
- Action
- Apply Citrix security patch for CVE-2026-8452 immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-8452
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-8452Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 62% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-8452 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedCitrix security advisory (AV26-645) – Update 3cccs
- highexploitedCISA Adds Six Known Exploited Vulnerabilities to Catalogcisa
- unknownNCSC-2026-0216 [1.01] [M/H] Vulnerabilities Fixed in Citrix Netscaler ADC and Netscaler Gatewayncsc-nl
- unknownCitrix Products Multiple Vulnerabilitieshkcert
- unknownAL26-016 - Vulnerability impacting Citrix NetScaler CVE-2026-8451cccs
- high[UPDATE] [high] Citrix Systems NetScaler ADC and Gateway: Multiple vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Citrix products (July 1, 2026)cert-fr-avis
- unknownNCSC-2026-0216 [1.00] [M/H] Vulnerabilities fixed in Citrix Netscaler ADC and Netscaler Gatewayncsc-nl
- criticalCVE-2026-8452: Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or e…nvd
Recent advisories for Citrix NetScaler ADC
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEW] [high] Citrix Systems NetScaler (Gateway and ADC): Multiple vulnerabilitiescert-bund · 2026-08-20
- unknownNCSC-2026-0318 [1.00] [M/M] Vulnerabilities resolved in Citrix NetScaler ADC and NetScaler Gatewayncsc-nl · 2026-08-20
- critical2026-010: Critical Vulnerabilities in Citrix NetScaler ADC and NetScaler Gatewaycert-eu · 2026-08-19
- unknownNCSC-2026-0216 [1.01] [M/H] Vulnerabilities Fixed in Citrix Netscaler ADC and Netscaler Gatewayncsc-nl · 2026-08-18
- high[UPDATE] [high] Citrix Systems NetScaler ADC and Gateway: Multiple vulnerabilitiescert-bund · 2026-07-02
- unknownNCSC-2026-0216 [1.00] [M/H] Vulnerabilities fixed in Citrix Netscaler ADC and Netscaler Gatewayncsc-nl · 2026-06-30
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