CVE-2005-3671

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2005-11-18 · updated 2026-06-16

Description

The Internet Key Exchange version 1 (IKEv1) implementation in Openswan 2 (openswan-2) before 2.4.4, and freeswan in SUSE LINUX 9.1 before 2.04_1.5.4-1.23, allow remote attackers to cause a denial of service via (1) a crafted packet using 3DES with an invalid key length, or (2) unspecified inputs when Aggressive Mode is enabled and the PSK is known, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1.

Affected products

Frees Wan: 2.04
Openswan: 2.1.1, 2.1.2, 2.1.4, 2.1.5, 2.1.6, 2.2 (+1)
Xelerance Openswan: 2.4.0

References

http://archives.neohapsis.com/archives/bugtraq/2005-12/0138.html
http://archives.neohapsis.com/archives/bugtraq/2005-12/0161.html
http://jvn.jp/niscc/NISCC-273756/index.html
http://secunia.com/advisories/17581
http://secunia.com/advisories/17680
http://secunia.com/advisories/17980
http://secunia.com/advisories/18115
http://securitytracker.com/id?1015214
http://www.ee.oulu.fi/research/ouspg/protos/testing/c09/isakmp/
http://www.gentoo.org/security/en/glsa/glsa-200512-04.xml
http://www.kb.cert.org/vuls/id/226364
http://www.niscc.gov.uk/niscc/docs/re-20051114-01014.pdf?lang=en

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