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CVE-2025-5777

NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread

Published: Jun 17, 2025Updated: Oct 30, 2025 Sources: CVE List NVD BDUCWE-125
NVD MITRE
7.5CVSSHIGH
EPSS Score
99.9%
Top 0.0%
CISA KEV
Active Exploitation
Since Jul 10, 2025
Exploits
No Known Exploits
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

Description

Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-125CWE-908CWE-457

Affected Products

NetScaler Application Delivery ControllerCitrix Systems Inc.
Mixed
Cloud & SaaS
NetScaler GatewayCitrix Systems Inc.
Mixed
Cloud & SaaS
netscaler application delivery controllercitrix
On-premNetwork Device
Networking Infrastructure / load-balancer-proxy
netscaler gatewaycitrix
On-premSecurity Product
Networking Infrastructure
ADCNetScaler
On-prem
Networking Infrastructure / load-balancer-proxy
citrix systems inc.commercialUSCloud & SaaSaka citrix adc, netscaler gateway, citrix gateway
citrixcommercialUSCloud & SaaSaka xenserver, netscaler gateway firmware, application delivery controller firmware
netscalercommercialNetworking Infrastructure
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jul 10, 2025
Remediation due:Jul 11, 2025
Ransomware:Known ransomware use

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.

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
support.citrix.com
https://t.me/c/1627154862/198917
t.me
https://www.telsy.com/attacchi-rivolti-a-target-italiani-notificati-nuovi-data-breach-vulnerabilita-sfruttate-itw/
telsy.com
and 9 more references View all →

Timeline

Published
Jun 17, 2025
Added to CISA KEV
Jul 10, 2025
Last Updated
Oct 30, 2025
News mentions
5

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