CVEs / CVE-2025-7775
CVE-2025-7775: Citrix NetScaler Memory Overflow Vulnerability
- Known exploited in the CISA KEV catalog since 26 Aug 2025
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 20.6% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Citrix NetScaler ADC and NetScaler Gateway contain a memory overflow vulnerability that could allow for remote code execution and/or denial of service.
Description
Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) 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 (OR) 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
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| NetScaler ADC | from 14.1, before 47.48 | 47.48 |
| NetScaler ADC | from 13.1, before 59.22 | 59.22 |
| NetScaler ADC | from 13.1 FIPS and NDcPP, before 37.241 | 37.241 |
| NetScaler ADC | from 12.1 FIPS and NDcPP, before 55.330 | 55.330 |
| NetScaler Gateway | from 14.1, before 47.48 | 47.48 |
| NetScaler Gateway | from 13.1, before 59.22 | 59.22 |
| NetScaler Gateway | from 13.1 FIPS and NDcPP, before 37.241 | 37.241 |
| NetScaler Gateway | from 12.1 FIPS and NDcPP, before 55.330 | 55.330 |
Exploitation
| In CISA KEV since | 26 Aug 2025 |
|---|---|
| Due date for US federal agencies | 28 Aug 2025 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
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-2025-7775 on NVD
- CVE-2025-7775 in the CISA KEV catalog
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938 (cited by CISA)
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-7775 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.