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If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is \"this is not an authentication bypass, since nothing is being bypassed.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-36368.json","reference_id":"","reference_type":"","scores":[],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-36368.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-36368","reference_id":"","reference_type":"","scores":[{"value":"0.00432","scoring_system":"epss","scoring_elements":"0.63023","published_at":"2026-06-04T12:55:00Z"},{"value":"0.00432","scoring_system":"epss","scoring_elements":"0.63067","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00432","scoring_system":"epss","scoring_elements":"0.63075","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00432","scoring_system":"epss","scoring_elements":"0.63065","published_at":"2026-06-07T12:55:00Z"},{"value":"0.00432","scoring_system":"epss","scoring_elements":"0.63052","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00432","scoring_system":"epss","scoring_elements":"0.63069","published_at":"2026-06-09T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-36368"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36368","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36368"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"0","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:N"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=2086690","reference_id":"2086690","reference_type":"","scores":[],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2086690"},{"reference_url":"https://github.com/openssh/openssh-portable/pull/258","reference_id":"258","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-29T18:46:16Z/"}],"url":"https://github.com/openssh/openssh-portable/pull/258"},{"reference_url":"https://security-tracker.debian.org/tracker/CVE-2021-36368","reference_id":"CVE-2021-36368","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-29T18:46:16Z/"}],"url":"https://security-tracker.debian.org/tracker/CVE-2021-36368"},{"reference_url":"https://www.openssh.com/security.html","reference_id":"security.html","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-29T18:46:16Z/"}],"url":"https://www.openssh.com/security.html"},{"reference_url":"https://bugzilla.mindrot.org/show_bug.cgi?id=3316","reference_id":"show_bug.cgi?id=3316","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-29T18:46:16Z/"}],"url":"https://bugzilla.mindrot.org/show_bug.cgi?id=3316"},{"reference_url":"https://docs.ssh-mitm.at/trivialauth.html","reference_id":"trivialauth.html","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-29T18:46:16Z/"}],"url":"https://docs.ssh-mitm.at/trivialauth.html"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/488780?format=json","purl":"pkg:apk/alpine/openssh@8.9_p1-r0?arch=armv7&distroversion=v3.20&reponame=main","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/openssh@8.9_p1-r0%3Farch=armv7&distroversion=v3.20&reponame=main"}],"aliases":["CVE-2021-36368"],"risk_score":1.6,"exploitability":"0.5","weighted_severity":"3.3","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-ku5v-32rk-5qbv"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:apk/alpine/openssh@8.9_p1-r0%3Farch=armv7&distroversion=v3.20&reponame=main"}