CVE-2025-5777NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread

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

9.3 CRITICALEPSS 99.97%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-10-08 10:35 UTC

OverviewCVSS details

9.3CRITICALCVSS 4.0

Score source: Citrix (CNA)
NVD status: Analyzed
Published: Jun 17, 2025
Assigner: Citrix

Affected

ADC (NetScaler)

Versions: 14.1 before 43.56 · 13.1 before 58.32
Fixed in: 43.56, 58.32

+1 more product →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Jul 10, 2025
KEV due date: Jul 11, 2025
Ransomware use: Known
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

99.97%chance of exploitation in 30 days

Higher than 99.97% of CVEs

CVSS 4.0 · Citrix (CNA)

9.3Critical

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

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: High
Integrity impact: High
Availability impact: High
Confidentiality (other systems): Low
Integrity (other systems): Low
Availability (other systems): Low

CVSS 3.1 · NVD

7.5High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.3	CRITICAL	4.0Citrix (CNA)	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
7.5	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA required action

⚡ Known exploited · remediation due Jul 11, 2025

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Details

CVE ID: CVE-2025-5777
Status: Analyzed
Assigner (CNA): Citrix
Published: Jun 17, 2025
Last modified: 2026-10-08 10:35 UTC
Weaknesses: CWE-125 · Out-of-bounds Read
CWE-908

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 11:30 UTC.