Out-of-bounds Read in Netscaler Adc

CVE-2025-5777

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

Vulnerability class: Buffer Overflow

EPSS: 0.650 (98.5th percentile) — read the EPSS interpretation.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-5777?
CVE-2025-5777 is a vulnerability in Netscaler Adc, classified under Out-of-bounds Read. Published 2025-06-17.
Is CVE-2025-5777 known to be exploited?
Yes. CVE-2025-5777 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-07-10), indicating it is being actively exploited. 46 public proof-of-concept repositories are indexed.