CVE-2002-1697: Electronic Code Book (ECB) mode in VTun 2.0 through 2.5 uses a weak encryption algorithm that produces the...

Security readout for executives and security teams

CVE-2002-1697 concerns VTun 2.0 through 2.5 using ECB encryption mode, which can reveal patterns because identical plaintext blocks encrypt to identical ciphertext blocks. The issue can expose sensitive information carried through affected tunnels. The bundle does not provide a CVSS score, confirmed patch, or evidence of active exploitation. Exposure is most likely where legacy VTun 2.0 through 2.5 is still used for encrypted tunneling. Modern environments are unlikely to be exposed unless old appliances, scripts, or unsupported VPN-style services remain in production or lab networks. Treat this as a legacy exposure review rather than an emergency internet-wide incident. Prioritize finding old VTun deployments because sensitive traffic over affected tunnels may not be adequately protected. Mitigation focus: Identify any VTun deployments and confirm exact versions.; Check VTun vendor or maintainer guidance for fixed versions or migration advice.; Do not rely on affected tunnels for sensitive traffic until remediation is confirmed..

Prepared

Jun 29, 2026, 19:56 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.