{"api_version":"1","generated_at":"2026-07-23T13:22:24+00:00","cve":"CVE-2021-3047","urls":{"html":"https://cve.report/CVE-2021-3047","api":"https://cve.report/api/cve/CVE-2021-3047.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-3047","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3047"},"summary":{"title":"CVE-2021-3047","description":"A cryptographically weak pseudo-random number generator (PRNG) is used during authentication to the Palo Alto Networks PAN-OS web interface. This enables an authenticated attacker, with the capability to observe their own authentication secrets over a long duration on the PAN-OS appliance, to impersonate another authenticated web interface administrator's session. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.19; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.10; PAN-OS 10.0 versions earlier than PAN-OS 10.0.4. PAN-OS 10.1 versions are not impacted.","state":"PUBLIC","assigner":"psirt@paloaltonetworks.com","published_at":"2021-08-11 17:15:00","updated_at":"2021-08-19 20:03:00"},"problem_types":["CWE-338"],"metrics":[],"references":[{"url":"https://security.paloaltonetworks.com/CVE-2021-3047","name":"N/A","refsource":"CONFIRM","tags":[],"title":"CVE-2021-3047 PAN-OS: Weak Cryptography Used in Web Interface Authentication","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3047","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3047","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"LEGACY","value":"Palo Alto Networks thanks Google Security for discovering and reporting this issue.","lang":""}],"nvd_cpes":[{"cve_year":"2021","cve_id":"3047","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"paloaltonetworks","cpe5":"pan-os","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-3047","qid":"730159","title":"Palo Alto Networks PAN-OS Weak Cryptography Used in Web Interface Authentication(PAN-156240)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"psirt@paloaltonetworks.com","DATE_PUBLIC":"2021-08-11T16:00:00.000Z","ID":"CVE-2021-3047","STATE":"PUBLIC","TITLE":"PAN-OS: Weak Cryptography Used in Web Interface Authentication"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"PAN-OS","version":{"version_data":[{"version_affected":"<","version_name":"8.1","version_value":"8.1.19"},{"version_affected":"<","version_name":"9.0","version_value":"9.0.14"},{"version_affected":"<","version_name":"10.0","version_value":"10.0.4"},{"version_affected":"<","version_name":"9.1","version_value":"9.1.10"},{"version_affected":"!>=","version_name":"8.1","version_value":"8.1.19"},{"version_affected":"!>=","version_name":"9.0","version_value":"9.0.14"},{"version_affected":"!>=","version_name":"10.0","version_value":"10.0.4"},{"version_affected":"!>=","version_name":"9.1","version_value":"9.1.10"},{"version_affected":"!","version_name":"10.1","version_value":"10.1.*"}]}}]},"vendor_name":"Palo Alto Networks"}]}},"configuration":[{"lang":"eng","value":"There is no specific configuration required for this exposure—all web interface authentication methods are impacted by this issue."}],"credit":[{"lang":"eng","value":"Palo Alto Networks thanks Google Security for discovering and reporting this issue."}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"A cryptographically weak pseudo-random number generator (PRNG) is used during authentication to the Palo Alto Networks PAN-OS web interface. 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