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How the CVE Works:
CVE-2025-5777 is an out-of-bounds read vulnerability in Citrix NetScaler ADC and Gateway when configured as a VPN virtual server, ICA Proxy, CVPN, RDP Proxy, or AAA virtual server. The flaw stems from insufficient input validation, allowing attackers to read sensitive memory contents. Exploitation occurs when maliciously crafted requests bypass input checks, leading to unauthorized memory access. This can expose session tokens, credentials, or other critical data. The vulnerability affects versions 13.1-58.32 and below, 14.1-43.56 and below, and FIPS-enabled 12.1-55.328 and below.
DailyCVE Form:
Platform: Citrix NetScaler
Version: 13.1-58.32, 14.1-43.56, 12.1-55.328
Vulnerability: Out-of-Bounds Read
Severity: Critical
Date: 2025-07-10
Prediction: Patch by 2025-07-25
What Undercode Say:
curl -X GET "http://<target>/vpn/index.html" -H "X-Forwarded-For: <malicious_payload>"
import requests
response = requests.get("http://<target>/vpn/index.html", headers={"X-Forwarded-For": "<exploit_payload>"})
How Exploit:
- Crafted HTTP requests to VPN endpoints.
- Memory dump extraction via repeated exploitation.
- Session token hijacking for lateral movement.
Protection from this CVE:
- Apply Citrix patches 13.1-58.32, 14.1-43.56, 12.1-55.328+.
- Disable unused Gateway services.
- Enforce strict input validation.
Impact:
- Data exfiltration.
- Unauthorized access.
- Credential theft.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
