CVE-2006-1646 — The Internet Key Exchange version 1 (IKEv1) implementation (isakmp_agg.c) in the Shoichi Sakane KAME Project racoon, as used by NetBSD 1.6, 2.x before 20060119, certain FreeBSD releases, and possibly other distributions of BSD or Linux operating systems, when running in aggressive mode, allows remote attackers to cause a denial of service (daemon crash) via crafted IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1

Back Back to CVE browser

MEDIUM

The Internet Key Exchange version 1 (IKEv1) implementation (isakmp_agg.c) in the Shoichi Sakane KAME Project racoon, as used by NetBSD 1.6, 2.x before 20060119, certain FreeBSD releases, and possibly other distributions of BSD or Linux operating systems, when running in aggressive mode, allows remote attackers to cause a denial of service (daemon crash) via crafted IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1

Published Apr 6, 2006

5.0

MEDIUM

CVSS 2.0

EPSS 2.41%

Description

The Internet Key Exchange version 1 (IKEv1) implementation (isakmp_agg.c) in the Shoichi Sakane KAME Project racoon, as used by NetBSD 1.6, 2.x before 20060119, certain FreeBSD releases, and possibly other distributions of BSD or Linux operating systems, when running in aggressive mode, allows remote attackers to cause a denial of service (daemon crash) via crafted IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.41% 0.02407

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02407

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (15 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.41% (0.02407)	83.48th	v5 (v2026.06.15)
Jun 15, 2026	2.48% (0.02481)	82.45th	v5 (v2026.06.15)
Mar 17, 2025	1.07% (0.01066)	76.16th	v4 (v2025.03.14)
Dec 12, 2024	1.83% (0.01834)	88.76th	v3 (v2023.03.01)
Sep 17, 2024	1.83% (0.01834)	88.54th	v3 (v2023.03.01)
May 24, 2024	0.65% (0.00649)	79.32th	v3 (v2023.03.01)
May 10, 2024	0.55% (0.00546)	77.29th	v3 (v2023.03.01)
Apr 25, 2024	0.46% (0.00462)	75.10th	v3 (v2023.03.01)
Mar 15, 2024	0.44% (0.00440)	74.24th	v3 (v2023.03.01)
Feb 8, 2024	0.37% (0.00370)	71.81th	v3 (v2023.03.01)
Mar 7, 2023	1.83% (0.01834)	86.38th	v3 (v2023.03.01)
Mar 6, 2023	1.21% (0.01213)	66.61th	v2 (v2022.01.01)
Feb 17, 2023	1.21% (0.01213)	66.22th	v2 (v2022.01.01)
Apr 1, 2022	1.21% (0.01213)	64.21th	v2 (v2022.01.01)
Feb 4, 2022	1.21% (0.01213)	40.54th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

References (5)

ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2006-003.txt.asc
vendor-advisoryx_refsource_NETBSD
http://mail-index.netbsd.org/source-changes/2006/01/19/0017.html
x_refsource_CONFIRM
http://secunia.com/advisories/19463
third-party-advisoryx_refsource_SECUNIAVendor Advisory
http://www.ee.oulu.fi/research/ouspg/protos/testing/c09/isakmp/
x_refsource_MISC
http://www.niscc.gov.uk/niscc/docs/re-20051114-01014.pdf?lang=en
x_refsource_MISC

Link	Providers	Tags
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2006-003.txt.asc		vendor-advisoryx_refsource_NETBSD
http://mail-index.netbsd.org/source-changes/2006/01/19/0017.html		x_refsource_CONFIRM
http://secunia.com/advisories/19463		third-party-advisoryx_refsource_SECUNIAVendor Advisory
http://www.ee.oulu.fi/research/ouspg/protos/testing/c09/isakmp/		x_refsource_MISC
http://www.niscc.gov.uk/niscc/docs/re-20051114-01014.pdf?lang=en		x_refsource_MISC

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Apr 6, 2006

Updated Sep 16, 2024

Reserved Apr 6, 2006

Link CVE-2006-1646

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2006-1646

Red Hat

Severity n/a

Public date n/a

Links CVE-2006-1646