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.

Risk summary

HighCISA KEVRansomware

7.5

CVSS v3 base

100%

EPSS exploit probability

High

Severity

2025-07-10

Added to KEV

2025-07-11 (past due)

CISA due date

Actively exploited Citrix NetScaler ADC and Gateway vulnerability, High severity, CVSS v3 7.5. Added to the CISA KEV catalog 2025-07-10.

Senserva AI read on CVE-2025-5777 CISA required action Official fix for CVE-2025-5777 Admin questions

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.

I run IT security. Facts for CVE-2025-5777, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2025-5777.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2025-5777: Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
- Affected: Citrix NetScaler ADC and Gateway
- Severity: High, CVSS v3 7.5; EPSS 30-day exploitation probability 100%
- Added to CISA KEV: 2025-07-10; federal remediation due 2025-07-11
- Ransomware-linked: YES
- 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.
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch immediately

Exploited in the wild and used in ransomware campaigns.

The fix ships from the vendor: Citrix Security Bulletins.

Do this now: Move this ahead of everything else in the queue, then verify the fix actually landed on every exposed device.

Updated August 24, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2025-5777

Published: 2025-07-10
Last revised: 2025-07-10
Changes tracked: 1

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.

Senserva Watchevery change we have recorded for this one

What changed, and when

Drawn by Senserva Vivid from the Senserva change record. Hover any point for its date and value.

2025-07-10 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 7.5; EPSS first scored at 99.9%
2026-07-23 EPSS 99.9% to 99.9%
2026-07-24 EPSS 99.9% to 99.9%
2026-07-27 EPSS 99.9% to 100.0%
2026-08-02 EPSS 100.0% to 100.0%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

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.

Citrix Security Bulletins CISA KEV entry

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).

Scope and sources

More exploited Citrix CVEs: CVE-2026-3055 CVE-2025-7775 CVE-2024-8069 CVE-2024-8068 CVE-2025-6543 CVE-2023-6549 CVE-2023-6548 CVE-2023-4966
All Citrix exploited CVEs on one page: Citrix vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.