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(A related vulnerability, Speculative Code Store Bypass (SCSB), did not affect Firefox.)","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-29955","reference_id":"","reference_type":"","scores":[{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75558","published_at":"2026-05-12T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75561","published_at":"2026-05-09T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75542","published_at":"2026-05-11T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75361","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75365","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75397","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75377","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75419","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75429","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75449","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75427","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75416","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75457","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75463","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75452","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75487","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75492","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75496","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75507","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00884","scoring_system":"epss","scoring_elements":"0.75536","published_at":"2026-05-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-29955"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23981","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23981"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23982","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23982"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23984","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23984"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23987","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23987"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29955","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29955"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4127","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4127"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-10","reference_id":"mfsa2021-10","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-10"},{"reference_url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-11","reference_id":"mfsa2021-11","reference_type":"","scores":[{"value":"high","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-11"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/86301?format=json","purl":"pkg:mozilla/Firefox@87.0.0","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:mozilla/Firefox@87.0.0"}],"aliases":["CVE-2021-29955"],"risk_score":4.0,"exploitability":"0.5","weighted_severity":"8.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-dy9a-9mc6-hfbc"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:mozilla/Firefox@87.0.0"}