Private IP addresses disclosed
Summary: PortSwigger Research describes a scanner finding in which private IP addresses reserved under RFC 1918 for internal networks are disclosed, even though those addresses cannot be routed on the public internet and are not usually discoverable the way public IPs are. The text notes the addresses can appear in service banners or debug messages, and that where they are used to track back-end servers for load balancing they should be rewritten with innocuous identifiers.
Key Takeaway: Discovering the private addresses used inside an organization helps an attacker carry out network-layer attacks aimed at penetrating its internal infrastructure, and the source states there is not usually any good reason to disclose them.
Read the original at PortSwigger Research ↗
- Topics
- Vulnerabilities & Patching
- Related
- Attackers Exploit UnrealIRCd Flaw That Enables Server-Level Command Injection Cyber Risks · Nov 14, 2026U.S. CISA adds Check Point and UnrealIRCd flaws to its Known Exploited Vulnerabilities catalog Cyber Risks · Nov 14, 2026PostgreSQL Patches 52 Flaws, Including 22-Year-Old Bug Enabling Authenticated RCE Cyber Risks · Nov 13, 2026