Multiple vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway (July 1, 2025)
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.
[Update on July 17, 2025] The vendor has published a link containing a method for assessing attempts to exploit in application and system logs [12]. [Update on July 7, 2025] On June 17, 2025, Citrix released a security bulletin...
CSIRTS triage
- What
- Multiple vulnerabilities have been identified.
- Who is affected
- Users of Citrix NetScaler ADC and NetScaler Gateway.
- Urgency
- Remediation is urgent as exploitation attempts have been detected.
- Action
- Refer to the security bulletin for mitigation methods.
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-2025-ALE-009/
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-2025-6543Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 95% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2025-5777Already 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-2025-6543 | coverage & exploitation status | NVD · CVE.org |
| CVE-2025-5777 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- criticalexploitedCVE-2025-5777: Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerabilitycisa-kev
- criticalexploitedCVE-2025-6543: Citrix NetScaler ADC and Gateway Buffer Overflow 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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