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7.5

FreeBSD, NetBSD and OpenBSD IPsec may forward forged packets

CVE-2002-0414 · published 24 years ago
Summary

The IPsec security feature in FreeBSD 4.5, NetBSD 1.5.2, and similar systems does not correctly check its security policy rules, allowing a gateway that does not use encryption to accidentally forward fake IPv4 traffic. This can let attackers send counterfeit data through your network without detection. Update to a patched version of the operating system or apply the vendor's security update to ensure policies are enforced correctly.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
freebsd freebsd 4.2
4.3
4.4
4.5
cpe:2.3:o:freebsd:freebsd:4.2:*:*:*:*:*:*:*
netbsd netbsd 1.5
1.5.1
1.5.2
cpe:2.3:o:netbsd:netbsd:1.5:*:*:*:*:*:*:*
openbsd openbsd 2.6
2.7
cpe:2.3:o:openbsd:openbsd:2.6:*:*:*:*:*:*:*
Original advisory text
KAME-derived implementations of IPsec on NetBSD 1.5.2, FreeBSD 4.5, and other operating systems, does not properly consult the Security Policy Database (SPD), which could cause a Security Gateway (...
KAME-derived implementations of IPsec on NetBSD 1.5.2, FreeBSD 4.5, and other operating systems, does not properly consult the Security Policy Database (SPD), which could cause a Security Gateway (SG) that does not use Encapsulating Security Payload (ESP) to forward forged IPv4 packets.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.5 High
Exploitation
1% chance of attack within 30 days
Timeline
Published12 Aug 2002
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2002-0414 · NVD
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