CVE-2025-5777
Citrix — Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
Citrix · CWE-125 — Out-of-bounds read | CWE-908 · in CISA KEV since 2025-07-10
EVRS 94 of 100 Immediate
Out-of-Band / Urgent Remediation
Rank 42 of 2,960 tracked
Why it scores 94
Evidence available: 6 of 7 signalsListed in the CISA KEV catalog, and associated with known ransomware campaigns.
- CISA KEVApplied
- RansomwareApplied
- Vendor exploitationDid not apply
- EPSSApplied
- Microsoft Exploitability IndexNot applicable
- Pre-patch disclosureNo data
- KEV recencyDid not apply
- CVSSApplied
The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data
Fix
Patch or fixed version identifiedCISA required action
Fixed in
netscaler application delivery controller: update to 12.1-55.328 or later | netscaler application delivery controller: update to 13.1-37.235 or later | netscaler application delivery controller: update to 13.1-58.32 or later | netscaler application delivery controller: update to 14.1-43.56 or later | netscaler gateway: update to 13.1-58.32 or later | netscaler gateway: update to 14.1-43.56 or later
Affected versions
- netscaler application delivery controller
>= 12.1 < 12.1-55.328>= 13.1 < 13.1-37.235>= 13.1 < 13.1-58.32>= 14.1 < 14.1-43.56 - netscaler gateway
>= 13.1 < 13.1-58.32>= 14.1 < 14.1-43.56
Remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Fixed versions from NVD.
Evidence
Each value with its source| Measure | Value | Source |
|---|---|---|
| CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. | 9.3 | NVD |
| FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. | 0.999 (99.98th pctl) | FIRST EPSS |
| Actively exploitedWhether a source of record has confirmed attacks using it in the wild. | Confirmed | CISA KEV |
| Ransomware campaign useWhether CISA has seen ransomware operators use it. | Known | CISA KEV |
| CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. | 2025-07-11 · KEV since 2025 · listed over a year | CISA KEV |
| Public exploit moduleA module existing is not the same as active exploitation. | None known | Metasploit |
| EUVD cross-referenceENISA's record: CVSS 9.3 (v4.0), assigned by Citrix. | Listed | ENISA EUVD |
Description
NVDInsufficient 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
What CISA says to do