CVE-2009-2661
The asn1_length function in strongSwan 2.8 before 2.8.11, 4.2 before 4.2.17, and 4.3 before 4.3.3 does not properly handle X.509 certificates with crafted Relative Distinguished Names (RDNs), which allows remote attackers to cause a denial of service…
Does this matter?
Lower severity and a low EPSS score (1.58%). Track it; it rarely justifies an emergency change on its own.
Description
The asn1_length function in strongSwan 2.8 before 2.8.11, 4.2 before 4.2.17, and 4.3 before 4.3.3 does not properly handle X.509 certificates with crafted Relative Distinguished Names (RDNs), which allows remote attackers to cause a denial of service (pluto IKE daemon crash) via malformed ASN.1 data. NOTE: this is due to an incomplete fix for CVE-2009-2185.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
- EPSS
- 1.58% probability · 75th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-310
- Affected
- strongswan/strongswan
- Source
- cve@mitre.org
EPSS 1.6% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://download.strongswan.org/patches/07_asn1_length_patch/strongswan-4.3.x_asn1_length.patch
- http://download.strongswan.org/patches/07_asn1_length_patch/strongswan-4.x.x_asn1_length.patchPatch
- http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
- http://secunia.com/advisories/36922
- http://up2date.astaro.com/2009/08/up2date_7505_released.html
- http://www.debian.org/security/2009/dsa-1899
- http://www.openwall.com/lists/oss-security/2009/07/27/1
- http://www.vupen.com/english/advisories/2009/2247
- https://lists.strongswan.org/pipermail/announce/2009-July/000056.htmlPatch
- http://download.strongswan.org/patches/07_asn1_length_patch/strongswan-4.3.x_asn1_length.patch
- http://download.strongswan.org/patches/07_asn1_length_patch/strongswan-4.x.x_asn1_length.patchPatch
- http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
- http://secunia.com/advisories/36922
- http://up2date.astaro.com/2009/08/up2date_7505_released.html
- http://www.debian.org/security/2009/dsa-1899
- http://www.openwall.com/lists/oss-security/2009/07/27/1
- http://www.vupen.com/english/advisories/2009/2247
- https://lists.strongswan.org/pipermail/announce/2009-July/000056.htmlPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.