{"id":"ALPINE-CVE-2021-41991","details":"The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.","modified":"2026-09-15T08:17:46.691131418Z","published":"2021-10-18T14:15:10.333Z","upstream":["CVE-2021-41991"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-41991"}],"affected":[{"package":{"name":"strongswan","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.8.4-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r1"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r2"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}},{"package":{"name":"strongswan","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/strongswan?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.2.10"},{"fixed":"5.9.1-r3"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2021-41991.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}