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CISA KEV · Known exploitedCritical

CVE-2025-5777

NetScaler ADC, Gateway, netscaler application delivery controller

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
9.3
EPSS
100.0%
100.0% percentile
CISA KEV
Listed
Published
2025.06.17
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability100.0%
Technical severityCVSS 9.3

Vulnerability overview

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

Affected product and versions

Product
NetScaler ADC, Gateway, netscaler application delivery controller
Affected versions
>= 14.1 < 43.56, >= 13.1 < 58.32, >= 12.1 < 12.1-55.328, >= 13.1 < 13.1-37.235, >= 13.1 < 13.1-58.32, >= 14.1 < 14.1-43.56
Fixed versions
12.1-55.328, 13.1-37.235, 13.1-58.32, 14.1-43.56

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA 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.

Due date: 2025.07.11
  1. 1
    Identify

    Confirm that NetScaler ADC, Gateway, netscaler application delivery controller and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE
CWE-125, CWE-457, CWE-908
KEV added
2025.07.10
Ransomware use
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