CVE Feed

    Dashboard / CVE / CVE-2009-2661

    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 (pluto IKE daemon crash) via malformed ASN.1 data. NOTE: this is due to an incomplete fix for CVE-2009-2185.

    Published:Aug 4, 2009
    Last Modified:Apr 23, 2026
    EPS:Aug 4, 2009
    EPSS Score:0.01793
    CVSS Score:5

    Affected Products

    Vendor
    Strongswan
    Product
    Strongswan

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-78135 (CVSS 5.6) — libcharon in strongSwan 5.9.7 through 6.0.7 mishandles behavioral workflow in the IKEv2 state machine. Because…
    CVE-2026-78134 (CVSS 7.1) — strongSwan 4.5.0 through 6.0.7 has Incorrect Access Control in the eap-ttls and eap-peap plugins because there…
    CVE-2026-78133 (CVSS 7.5) — libcharon in strongSwan 6.0.0 through 6.0.7 has a use-after-free in IKEv2 rekeying collision handling.…
    CVE-2026-78132 (CVSS 7.5) — strongSwan 5.1.3 through 6.0.7 has an infinite loop in the x509 plugin's attribute certificate parser for ietf…
    CVE-2026-78131 (CVSS 3.7) — strongSwan 4.2.0 through 6.0.7 has a missing release of memory after its effective lifetime in the x509 plugin…
    CVE-2026-78130 (CVSS 7.5) — strongSwan 4.2.0 through 6.0.7 has a NULL pointer dereference in the x509 plugin's attribute certificate parse…
    CVE-2026-78129 (CVSS 5.9) — strongSwan 4.6.2 through 6.0.7 has an infinite loop in PKCS#5 decryption.…
    CVE-2026-78127 (CVSS 3.7) — libcharon in strongSwan 4.1.2 through 6.0.7 has a missing release of memory after its effective lifetime in th…
    CVE-2026-78126 (CVSS 5.9) — strongSwan 4.1.10 through 6.0.7 allows a NULL pointer dereference in the eap-aka plugin.…
    CVE-2026-78124 (CVSS 3.7) — strongSwan 5.0.2 through 6.0.7 allows PKCS#7 certificate enumeration in the openssl plugin that leads to a lac…

    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.patch
    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.html
    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.patch
    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.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High