{"cve":"CVE-2009-1957","nvd":{"published":"2009-06-08T01:00:00.733","modified":"2026-06-16T23:08:26.730","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-399"],"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"],"products":["strongswan:strongswan"],"source":"nvd","synced_at":"2026-10-19T19:54:07.895733559+00:00"},"epss":{"cve":"CVE-2009-1957","score":0.02947,"percentile":0.87157,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}