[Update] Vulnerability in Citrix NetScaler ADC and NetScaler Gateway (July 19, 2023)
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.
On July 18, 2023, Citrix published a security advisory regarding several vulnerabilities. The most critical, with the CVE ID CVE-2023-3519, allows an unauthenticated attacker to execute arbitrary code remotely. The equipment is vulnerable if configured as...
CSIRTS triage
- What
- An unauthenticated attacker can execute arbitrary code remotely.
- Who is affected
- Deployments of Citrix NetScaler ADC and NetScaler Gateway that are configured in a vulnerable manner.
- Urgency
- Remediation is urgent due to confirmed exploitation of the vulnerability.
- Action
- Apply the latest security updates provided by Citrix.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2023-ALE-008/
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-2023-3519Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2023-3519 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedCVE-2023-3519: Citrix NetScaler ADC and NetScaler Gateway Code Injection Vulnerabilitycisa-kev
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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