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    CVE-2009-1957

    charon/sa/ike_sa.c in the charon daemon in strongSWAN before 4.3.1 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an invalid IKE_SA_INIT request that triggers "an incomplete state," followed by a CREATE_CHILD_SA request.

    Published:Jun 6, 2009
    Last Modified:Apr 23, 2026
    EPS:Jun 6, 2009
    EPSS Score:0.01736
    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/CHANGES4.txt
    http://download.strongswan.org/patches/03_invalid_ike_state_patch/strongswan-4.x.x_invalid_ike_state.patch
    http://download.strongswan.org/patches/03_invalid_ike_state_patch/strongswan-4.x.x_invalid_ike_state.readme
    http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
    http://secunia.com/advisories/35296
    http://secunia.com/advisories/35685
    http://secunia.com/advisories/36922
    http://www.debian.org/security/2009/dsa-1899
    http://www.securityfocus.com/bid/35178
    https://lists.strongswan.org/pipermail/users/2009-May/003457.html
    http://download.strongswan.org/CHANGES4.txt
    http://download.strongswan.org/patches/03_invalid_ike_state_patch/strongswan-4.x.x_invalid_ike_state.patch
    http://download.strongswan.org/patches/03_invalid_ike_state_patch/strongswan-4.x.x_invalid_ike_state.readme
    http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html
    http://secunia.com/advisories/35296
    http://secunia.com/advisories/35685
    http://secunia.com/advisories/36922
    http://www.debian.org/security/2009/dsa-1899
    http://www.securityfocus.com/bid/35178
    https://lists.strongswan.org/pipermail/users/2009-May/003457.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