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The selected cipher set was stored in a single \"static\" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-22897.json","reference_id":"","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-22897.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-22897","reference_id":"","reference_type":"","scores":[{"value":"0.00791","scoring_system":"epss","scoring_elements":"0.74265","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00791","scoring_system":"epss","scoring_elements":"0.74259","published_at":"2026-06-04T12:55:00Z"},{"value":"0.00791","scoring_system":"epss","scoring_elements":"0.74292","published_at":"2026-06-09T12:55:00Z"},{"value":"0.00791","scoring_system":"epss","scoring_elements":"0.74297","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00791","scoring_system":"epss","scoring_elements":"0.74283","published_at":"2026-06-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-22897"},{"reference_url":"https://curl.se/docs/CVE-2021-22897.html","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Low","scoring_system":"cvssv3.1","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-28T19:47:49Z/"}],"url":"https://curl.se/docs/CVE-2021-22897.html"},{"reference_url":"https://hackerone.com/reports/1172857","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-28T19:47:49Z/"}],"url":"https://hackerone.com/reports/1172857"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1964904","reference_id":"1964904","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1964904"},{"reference_url":"https://security.archlinux.org/AVG-2016","reference_id":"AVG-2016","reference_type":"","scores":[{"value":"Low","scoring_system":"archlinux","scoring_elements":""}],"url":"https://security.archlinux.org/AVG-2016"},{"reference_url":"https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511","reference_id":"bbb71507b7bab52002f9b1e0880bed6a32834511","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-28T19:47:49Z/"}],"url":"https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511"},{"reference_url":"https://security.netapp.com/advisory/ntap-20210727-0007/","reference_id":"ntap-20210727-0007","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-28T19:47:49Z/"}],"url":"https://security.netapp.com/advisory/ntap-20210727-0007/"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/486672?format=json","purl":"pkg:apk/alpine/curl@0?arch=aarch64&distroversion=v3.13&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/curl@0%3Farch=aarch64&distroversion=v3.13&reponame=main"}],"aliases":["CVE-2021-22897"],"risk_score":2.4,"exploitability":"0.5","weighted_severity":"4.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-byzw-xw9s-pkga"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/curl@0%3Farch=aarch64&distroversion=v3.13&reponame=main"}