Exploited CVEs / Citrix / CVE-2025-5777
CVE-2025-5777
Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2025-07-11 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Citrix Security Bulletins, linked below.
Actively exploited Citrix NetScaler ADC and Gateway vulnerability, High severity, CVSS 7.5. Added to the CISA KEV catalog 2025-07-10.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2025-5777
An out-of-bounds read in Citrix NetScaler ADC and Gateway that leaks memory when the appliance is configured as a Gateway or AAA virtual server; in this class of flaw, leaked memory can include session tokens that sidestep MFA. EPSS sits at 100%, ransomware use is confirmed, and it has been on the KEV list since July 2025.
Do this: Patch NetScaler, then terminate all active sessions so any stolen tokens cannot be replayed.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2025-5777
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2025-5777
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2025-07-11 (past due).
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 fix for CVE-2025-5777
The authoritative fix and affected-version list are published by the vendor. Find the NetScaler ADC and Gateway advisory on Citrix Security Bulletins.
Common questions about CVE-2025-5777
Is CVE-2025-5777 actively exploited?
Yes. CVE-2025-5777 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2025-07-10, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2025-5777?
CISA set the federal (BOD 22-01) remediation due date at 2025-07-11, which has passed; treat any unremediated system as overdue. The verbatim 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.
What fixes CVE-2025-5777?
The authoritative fix is in the vendor advisory: see Citrix Security Bulletins for the patched NetScaler ADC and Gateway versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2025-5777?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2025-5777's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
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