Citrix fixed three NetScaler flaws, one of them actively exploited in the wild
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2025-7775 | Actively Exploited Memory Overflow RCE/DoS in Citrix NetScaler ADC/Gateway CVE-2025-7775 is a memory overflow (CWE-119) in Citrix NetScaler ADC and NetScaler Gateway that can lead to remote code execution and/or denial of service. It is triggered when the appliance is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, or RDP Proxy) or AAA virtual server, or — on 13.1, 14.1, 13.1-FIPS, and NDcPP builds — when load-balancing virtual servers of type HTTP, SSL, or HTTP_QUIC are bound with IPv6 services or servicegroups with IPv6 servers (including DBS IPv6), or a CR virtual server of type HDX is in use. A remote, unauthenticated attacker (CVSS 4.0 network vector with no privileges required) who triggers the memory overflow can execute code with high impact on confidentiality and integrity or crash the device. Organizations running NetScaler in these exposed configurations, notably as remote-access gateways, are affected. Exploitation is confirmed in the wild: Citrix has confirmed active exploitation, the flaw was added to CISA's KEV catalog on 2025-08-26, and EPSS estimates a 19.6% probability of exploitation within 30 days (97th percentile). Do: Upgrade all NetScaler ADC and Gateway appliances to the patched builds on the 13.1, 14.1, 13.1-FIPS, and NDcPP release trains identified in Citrix's security bulletin, prioritizing internet-facing devices. Audit configurations for Gateway (VPN/ICA Proxy/CVPN/RDP Proxy) or AAA virtual servers, HTTP/SSL/HTTP_QUIC LB virtual servers with IPv6 bindings, and CR virtual servers of type HDX to confirm exposure. The KEV listing makes applying vendor mitigations or the upgrade mandatory for US federal agencies under BOD 22-01. | 9.2 | 20% | KEV |
| large≈28,000+ internet-exposed NetScaler instances per public scans; total vulnerable deployments likely higher | |
| CVE-2025-7776 | Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is conf Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) with PCoIP Profile bounded to it NVD description · AI analysis pending | 8.8 | 7% |
| — | ||
| CVE-2025-8424 | Improper access control on the NetScaler Management Interface in NetScaler ADC and NetScaler Gateway when an attacker can get access to the appliance NSIP, Clus Improper access control on the NetScaler Management Interface in NetScaler ADC and NetScaler Gateway when an attacker can get access to the appliance NSIP, Cluster Management IP or local GSLB Site IP or SNIP with Management Access NVD description · AI analysis pending | 8.7 | 3% | — | — |
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Citrix addressed three vulnerabilities in NetScaler ADC and NetScaler Gateway, including one that has been actively exploited in the wild.
Citrix addressed three security flaws (CVE-2025-7775, CVE-2025-7776, CVE-2025-8424) in NetScaler ADC and NetScaler Gateway, including one (CVE-2025-7775) that it said has been actively exploited in the wild.
“Exploits of CVE-2025-7775 on unmitigated appliances have been observed.” reads the advisory.
Below is the description for these vulnerabilities:
- CVE-2025-7775 (CVSS score: 9.2) – Memory overflow vulnerability leading to Remote Code Execution and/or Denial-of-Service. Pre-conditions for exploitation: NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server; NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers; NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers; or CR virtual server with type HDX
- CVE-2025-7776 (CVSS score: 8.8) – Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service. Pre-conditions for exploitation: NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) with PCoIP Profile bounded to it.
- CVE-2025-8424 (CVSS score: 8.7) – Improper access control on the NetScaler Management Interface. Pre-conditions for exploitation: Access to NSIP, Cluster Management IP or local GSLB Site IP or SNIP with Management Access.
The company did not provide details about the attacks that exploited the flaw CVE-2025-7775.
Cloud Software Group urges NetScaler ADC and NetScaler Gateway customers to promptly update to secure versions: 14.1-47.48+, 13.1-59.22+, 13.1-FIPS/NDcPP 13.1-37.241+, and 12.1-FIPS/NDcPP 12.1-55.330+. Installing these updates is critical to mitigate security risks.
The vendor states that no workarounds are available.
The researchers Jimi Sebree of Horizon3.ai, Jonathan Hetzer of Schramm & Partnerfor and François Hämmerli reported the vulnerabilities.
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