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CVE-2025-5777 KEVRansomwarePublic exploit High · 7.5 EPSS >99.9%
Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
Citrix · NetScaler ADC and Gateway
Summary
Citrix NetScaler ADC and Gateway contain an out-of-bounds read flaw caused by insufficient input validation, affecting deployments configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or as an AAA virtual server. An attacker with network access can trigger a memory overread without authentication or user interaction, potentially disclosing sensitive information from device memory.
Official description · NVD
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
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
82.1 / 100
- Exploited
- Yes, in CISA KEV
- Reports
- 1
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 9 days after disclosure. Public exploit code (PoC-in-GitHub) appeared 13 days after disclosure.
- Disclosedday 0
- First seen exploitedVulnCheck KEV evidence+9 days
- Public exploit codePoC-in-GitHub+13 days
- Added to CISA KEVknown ransomware use; EU database agrees+23 days
- Named in a threat reportctrlaltintel.com+9 mo
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 2Initial AccessTA0001
MITRE CTID mapping of the KEV entry · how it is exploited
This memory leak vulnerability in Citrix NetScaler/ADC Gateway devices can be leveraged by sending malicious authentication requests, leaking sensitive information.
Credential AccessTA0006
MITRE CTID mapping of the KEV entry · primary impact
Detection
0 rules for this CVE · 157 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2025-5777 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Exploit Public-Facing ApplicationT1190149 general rules
- Arcadyan Router Exploitationscriticaltest
- Citrix ADS Exploitation CVE-2020-8193 CVE-2020-8195criticaltest
- Citrix Netscaler Attack CVE-2019-19781criticaltest
- Confluence Exploitation CVE-2019-3398criticaltest
- CVE-2010-5278 Exploitation Attemptcriticaltest
- CVE-2020-0688 Exchange Exploitation via Web Logcriticaltest
- CVE-2020-10148 SolarWinds Orion API Auth Bypasscriticaltest
- CVE-2020-5902 F5 BIG-IP Exploitation Attemptcriticaltest
Credentials from Password StoresT15558 general rules
- HackTool - SecurityXploded Executioncriticalstable
- DPAPI Backup Keys And Certificate Export Activity IOChightest
- HackTool - WinPwn Executionhightest
- HackTool - WinPwn Execution - ScriptBlockhightest
- Suspicious Serv-U Process Patternhightest
- Dump Credentials from Windows Credential Manager With PowerShellmediumtest
- Enumerate Credentials from Windows Credential Manager With PowerShellmediumtest
- PUA - AWS TruffleHog Executionmediumexperimental
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Named in 1 threat report1 reportctrlaltintel.comMar 2026
Reports are matched by finding the exact id CVE-2025-5777 in their text; nobody has reviewed the match. One passage is shown per report, at most 320 characters, linked to the original.
Also mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 30, 202629 Oct 2026
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- 44 more on OTX