{"api_version":"1","generated_at":"2026-07-23T12:35:02+00:00","cve":"CVE-2021-3055","urls":{"html":"https://cve.report/CVE-2021-3055","api":"https://cve.report/api/cve/CVE-2021-3055.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-3055","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3055"},"summary":{"title":"CVE-2021-3055","description":"An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; 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 10.0.6. This issue does not affect Prisma Access.","state":"PUBLIC","assigner":"psirt@paloaltonetworks.com","published_at":"2021-09-08 17:15:00","updated_at":"2021-09-15 19:04:00"},"problem_types":["CWE-611"],"metrics":[],"references":[{"url":"https://security.paloaltonetworks.com/CVE-2021-3055","name":"N/A","refsource":"CONFIRM","tags":[],"title":"CVE-2021-3055 PAN-OS: XML External Entity (XXE) Reference Vulnerability in the PAN-OS Web Interface","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3055","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3055","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"LEGACY","value":"This issue was found by a customer of Palo Alto Networks during a security review.","lang":""}],"nvd_cpes":[{"cve_year":"2021","cve_id":"3055","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-2021-3055","qid":"730190","title":"Palo Alto Networks PAN-OS XML External Entity (XXE) Reference Vulnerability in the PAN-OS Web Interface (PAN-166241)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"psirt@paloaltonetworks.com","DATE_PUBLIC":"2021-09-08T16:00:00.000Z","ID":"CVE-2021-3055","STATE":"PUBLIC","TITLE":"PAN-OS: XML External Entity (XXE) Reference Vulnerability in the PAN-OS Web Interface"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"PAN-OS","version":{"version_data":[{"version_affected":"<","version_name":"9.0","version_value":"9.0.14"},{"version_affected":"<","version_name":"9.1","version_value":"9.1.10"},{"version_affected":"<","version_name":"10.0","version_value":"10.0.6"},{"version_affected":"<","version_name":"8.1","version_value":"8.1.20"},{"version_affected":"!>=","version_name":"9.0","version_value":"9.0.14"},{"version_affected":"!>=","version_name":"9.1","version_value":"9.1.10"},{"version_affected":"!>=","version_name":"10.0","version_value":"10.0.6"},{"version_affected":"!>=","version_name":"8.1","version_value":"8.1.20"},{"version_affected":"!","version_name":"10.1","version_value":"10.1.*"}]}}]},"vendor_name":"Palo Alto Networks"}]}},"credit":[{"lang":"eng","value":"This issue was found by a customer of Palo Alto Networks during a security review."}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; 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 10.0.6. This issue does not affect Prisma Access."}]},"exploit":[{"lang":"eng","value":"Palo Alto Networks is not aware of any malicious attempts to exploit this vulnerability."}],"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-611 Improper Restriction of XML External Entity Reference ('XXE')"}]}]},"references":{"reference_data":[{"refsource":"MISC","url":"https://security.paloaltonetworks.com/CVE-2021-3055","name":"https://security.paloaltonetworks.com/CVE-2021-3055"}]},"solution":[{"lang":"eng","value":"This issue is fixed in PAN-OS 8.1.20, PAN-OS 9.0.14, PAN-OS 9.1.10, PAN-OS 10.0.6, and all later PAN-OS versions."}],"source":{"defect":["PAN-166241"],"discovery":"EXTERNAL"},"timeline":[{"lang":"eng","time":"2021-09-08T16:00:00.000Z","value":"Initial publication"}],"work_around":[{"lang":"eng","value":"This issue requires the attacker to have authenticated access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices."}],"x_advisoryEoL":false,"x_affectedList":["PAN-OS 10.0.5","PAN-OS 10.0.4","PAN-OS 10.0.3","PAN-OS 10.0.2","PAN-OS 10.0.1","PAN-OS 10.0.0","PAN-OS 10.0","PAN-OS 9.1.9","PAN-OS 9.1.8","PAN-OS 9.1.7","PAN-OS 9.1.6","PAN-OS 9.1.5","PAN-OS 9.1.4","PAN-OS 9.1.3-h1","PAN-OS 9.1.3","PAN-OS 9.1.2-h1","PAN-OS 9.1.2","PAN-OS 9.1.1","PAN-OS 9.1.0-h3","PAN-OS 9.1.0-h2","PAN-OS 9.1.0-h1","PAN-OS 9.1.0","PAN-OS 9.1","PAN-OS 9.0.13","PAN-OS 9.0.12","PAN-OS 9.0.11","PAN-OS 9.0.10","PAN-OS 9.0.9-h1","PAN-OS 9.0.9","PAN-OS 9.0.8","PAN-OS 9.0.7","PAN-OS 9.0.6","PAN-OS 9.0.5","PAN-OS 9.0.4","PAN-OS 9.0.3-h3","PAN-OS 9.0.3-h2","PAN-OS 9.0.3-h1","PAN-OS 9.0.3","PAN-OS 9.0.2-h4","PAN-OS 9.0.2-h3","PAN-OS 9.0.2-h2","PAN-OS 9.0.2-h1","PAN-OS 9.0.2","PAN-OS 9.0.1","PAN-OS 9.0.0","PAN-OS 9.0","PAN-OS 8.1.19","PAN-OS 8.1.18","PAN-OS 8.1.17","PAN-OS 8.1.16","PAN-OS 8.1.15-h3","PAN-OS 8.1.15-h2","PAN-OS 8.1.15-h1","PAN-OS 8.1.15","PAN-OS 8.1.14-h2","PAN-OS 8.1.14-h1","PAN-OS 8.1.14","PAN-OS 8.1.13","PAN-OS 8.1.12","PAN-OS 8.1.11","PAN-OS 8.1.10","PAN-OS 8.1.9-h4","PAN-OS 8.1.9-h3","PAN-OS 8.1.9-h2","PAN-OS 8.1.9-h1","PAN-OS 8.1.9","PAN-OS 8.1.8-h5","PAN-OS 8.1.8-h4","PAN-OS 8.1.8-h3","PAN-OS 8.1.8-h2","PAN-OS 8.1.8-h1","PAN-OS 8.1.8","PAN-OS 8.1.7","PAN-OS 8.1.6-h2","PAN-OS 8.1.6-h1","PAN-OS 8.1.6","PAN-OS 8.1.5","PAN-OS 8.1.4","PAN-OS 8.1.3","PAN-OS 8.1.2","PAN-OS 8.1.1","PAN-OS 8.1.0","PAN-OS 8.1"],"x_likelyAffectedList":["PAN-OS 8.0.20","PAN-OS 8.0.19-h1","PAN-OS 8.0.19","PAN-OS 8.0.18","PAN-OS 8.0.17","PAN-OS 8.0.16","PAN-OS 8.0.15","PAN-OS 8.0.14","PAN-OS 8.0.13","PAN-OS 8.0.12","PAN-OS 8.0.11-h1","PAN-OS 8.0.10","PAN-OS 8.0.9","PAN-OS 8.0.8","PAN-OS 8.0.7","PAN-OS 8.0.6-h3","PAN-OS 8.0.6-h2","PAN-OS 8.0.6-h1","PAN-OS 8.0.6","PAN-OS 8.0.5","PAN-OS 8.0.4","PAN-OS 8.0.3-h4","PAN-OS 8.0.3-h3","PAN-OS 8.0.3-h2","PAN-OS 8.0.3-h1","PAN-OS 8.0.3","PAN-OS 8.0.2","PAN-OS 8.0.1","PAN-OS 8.0.0","PAN-OS 8.0","PAN-OS 7.1.26","PAN-OS 7.1.25","PAN-OS 7.1.24-h1","PAN-OS 7.1.24","PAN-OS 7.1.23","PAN-OS 7.1.22","PAN-OS 7.1.21","PAN-OS 7.1.20","PAN-OS 7.1.19","PAN-OS 7.1.18","PAN-OS 7.1.17","PAN-OS 7.1.16","PAN-OS 7.1.15","PAN-OS 7.1.14","PAN-OS 7.1.13","PAN-OS 7.1.12","PAN-OS 7.1.11","PAN-OS 7.1.10","PAN-OS 7.1.9-h4","PAN-OS 7.1.9-h3","PAN-OS 7.1.9-h2","PAN-OS 7.1.9-h1","PAN-OS 7.1.9","PAN-OS 7.1.8","PAN-OS 7.1.7","PAN-OS 7.1.6","PAN-OS 7.1.5","PAN-OS 7.1.4-h2","PAN-OS 7.1.4-h1","PAN-OS 7.1.4","PAN-OS 7.1.3","PAN-OS 7.1.2","PAN-OS 7.1.1","PAN-OS 7.1.0","PAN-OS 7.1"]},"nvd":{"publishedDate":"2021-09-08 17:15:00","lastModifiedDate":"2021-09-15 19:04:00","problem_types":["CWE-611"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":1.2,"impactScore":5.2},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:P/I:N/A:C","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"COMPLETE","baseScore":7.5},"severity":"HIGH","exploitabilityScore":8,"impactScore":7.8,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*","versionStartIncluding":"9.1.0","versionEndExcluding":"9.1.10","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*","versionStartIncluding":"9.0.0","versionEndExcluding":"9.0.14","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*","versionStartIncluding":"8.1.0","versionEndExcluding":"8.1.20","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*","versionStartIncluding":"10.0.0","versionEndExcluding":"10.0.6","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"3055","Ordinal":"197910","Title":"CVE-2021-3055","CVE":"CVE-2021-3055","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"3055","Ordinal":"1","NoteData":"An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; 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 10.0.6. This issue does not affect Prisma Access.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"3055","Ordinal":"2","NoteData":"2021-09-08","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"3055","Ordinal":"3","NoteData":"2021-09-08","Type":"Other","Title":"Modified"}]}}}