CVE-2025-5777Known exploitationPublic exploitNetwork attack vector

Unauthenticated memory disclosure via bare login field

Published Jun 17, 2025 · Updated Aug 4, 2026

Memory disclosure in Citrix NetScaler ADC and Gateway 13.1 before 13.1-58.32 and 14.1 before 14.1-43.56 allows remote attackers to read stack data. At /p/u/doAuthentication.do, a bare login field marks a username as present without initializing its buffer, and nsppe formats residual stack bytes into the XML InitialValue response. No authentication is required, but the appliance must expose a Gateway or AAA virtual server; repeated requests can disclose other traffic and session material.

CVSS severity9.3
Critical
EPSS probability99.96%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory disclosure in Citrix NetScaler ADC and Gateway 13.1 before 13.1-58.32 and 14.1 before 14.1-43.56 allows remote attackers to read stack data. At /p/u/doAuthentication.do, a bare login field marks a username as present without initializing its buffer, and nsppe formats residual stack bytes into the XML InitialValue response. No authentication is required, but the appliance must expose a Gateway or AAA virtual server; repeated requests can disclose other traffic and session material.

The record

CVE
CVE-2025-5777
Published
Jun 17, 2025
Updated
Aug 4, 2026
Vendor
Cloud Software Group
Product
NetScaler Gateway
Classifications
CWE-908, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.1 <58.32
  2. Affected versionversion=14.1 <43.56

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloud Software Group · NetScaler Gatewayversion=13.1 <58.32; version=14.1 <43.56
Cloud Software Group · NetScaler ADCversion=13.1 <58.32; version=14.1 <43.56

Published CVSS scores

9.3CitrixCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 202682
Sep 11, 202683
Sep 12, 202680
Sep 13, 202684
Sep 14, 202685
Sep 15, 202681
Sep 16, 202681
Latest reporting daySep 16, 2026
Latest daily unique IPs81
Prior 30-day average76.7
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo