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CVE-2025-7775

Citrix NetScaler Memory Overflow

9.8 CRITICALActively exploited (CISA KEV)EPSS 20.3%
  1. Published26 Aug 2025
  2. Added to CISA KEV26 Aug 2025
  3. Remediation due28 Aug 2025
Actively exploited (CISA KEV)

Citrix NetScaler ADC and NetScaler Gateway contain a memory overflow vulnerability that could allow for remote code execution and/or denial of service.

Added to KEV: 26 Aug 2025Federal remediation due: 28 Aug 2025

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-59.22 · ≥ 14.1 < 14.1-47.48 · ≥ 12.1 < 12.1-55.330 · ≥ 13.1 < 13.1-37.241
Citrix NetScaler Gateway≥ 13.1 < 13.1-59.22 · ≥ 14.1 < 14.1-47.48

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-59.22
Citrix NetScaler Gateway≥ 13.1-59.22

References

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Frequently asked

Is CVE-2025-7775 being actively exploited?

Yes. CVE-2025-7775 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 26 Aug 2025.

How severe is CVE-2025-7775?

CVE-2025-7775 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 20.3% probability of exploitation.

Which products are affected by CVE-2025-7775?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2025-7775?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-59.22, Citrix NetScaler Gateway 13.1-59.22 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-7775 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.