Which products and versions are affected by CVE-2025-5777?

Affected: Netscaler Application Delivery Controller (Citrix) versions >= 14.1; Netscaler Gateway (Citrix) versions >= 14.1. The full list is in the CVE brief.

Is CVE-2025-5777 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 26, 2025 and is known to be used in ransomware campaigns.

Is CVE-2025-5777 in the CISA KEV catalog?

Yes. It was added on Jul 10, 2025 with a federal remediation due date of Jul 11, 2025.

Is there a public exploit for CVE-2025-5777?

Public exploit code is available.

Is there a fix for CVE-2025-5777?

Fixed versions are available, including Netscaler Application Delivery Controller 43.56, Netscaler Application Delivery Controller 58.32, Netscaler Application Delivery Controller 12.1-55.328.

How urgently should CVE-2025-5777 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2025-5777

CriticalExploitedPublic exploit

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

Published Jun 17, 2025 · Updated Oct 8, 2026

Key Facts

Patch immediately

CVE-2025-5777 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Netscaler Application Delivery Controller (Citrix), Netscaler Gateway (Citrix).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 26, 2025 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 100% probability of exploitation in the next 30 days.
Fixed versions are available, including Netscaler Application Delivery Controller 43.56, Netscaler Application Delivery Controller 58.32, Netscaler Application Delivery Controller 12.1-55.328.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v4

9.3

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

EPSS (30-day exploit likelihood)

100%

Higher than 99.9% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-5777 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Jul 10, 2025	Jul 11, 2025	Known
Industry KEV feed	Jun 26, 2025	Jul 11, 2025	Known
CIRCL KEV	Jul 2, 2025	Jul 11, 2025	Known
ENISA EUVD	Jul 10, 2025	n/a	Not reported

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.

Affected Products

6 affected entries in total

Product	Affected versions	Fixed in
Netscaler Application Delivery ControllerCitrix	>= 14.1	13.1-58.32
Netscaler GatewayCitrix	>= 14.1	13.1-58.32

Patched Releases

Netscaler Application Delivery Controller

43.56, 58.32, 12.1-55.328, 13.1-37.235, 13.1-58.32, 14.1-43.56

Netscaler Gateway

13.1-58.32, 14.1-43.56, 43.56, 58.32

Timeline

Publicly disclosed
Jun 17, 2025
Added to Industry KEV feed
Jun 26, 2025
Added to CIRCL KEV
Jul 2, 2025
Added to CISA KEV
Jul 10, 2025
Added to ENISA EUVD
Jul 10, 2025
Last updated
Oct 8, 2026

Weakness Type

CWE-125 Out-of-bounds Read
CWE-457 Use of Uninitialized Variable
CWE-908 Use of Uninitialized Resource

References

14 more references in the full CVE brief

FAQ

Common Questions.

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: Netscaler Application Delivery Controller (Citrix) versions >= 14.1; Netscaler Gateway (Citrix) versions >= 14.1. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 26, 2025 and is known to be used in ransomware campaigns.
Yes. It was added on Jul 10, 2025 with a federal remediation due date of Jul 11, 2025.
Public exploit code is available.
Fixed versions are available, including Netscaler Application Delivery Controller 43.56, Netscaler Application Delivery Controller 58.32, Netscaler Application Delivery Controller 12.1-55.328.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2025-5777 Running On Your Attack Surface?

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