{"api_version":"1","generated_at":"2026-04-22T21:37:40+00:00","cve":"CVE-2021-42697","urls":{"html":"https://cve.report/CVE-2021-42697","api":"https://cve.report/api/cve/CVE-2021-42697.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-42697","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-42697"},"summary":{"title":"CVE-2021-42697","description":"Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-11-02 22:15:00","updated_at":"2022-06-13 15:41:00"},"problem_types":["CWE-674"],"metrics":[],"references":[{"url":"http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html","name":"http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html","refsource":"MISC","tags":[],"title":"Akka HTTP 10.1.14 Denial Of Service ≈ Packet Storm","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://akka.io/blog/","name":"https://akka.io/blog/","refsource":"MISC","tags":[],"title":"News & Articles | Akka","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html","name":"https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html","refsource":"MISC","tags":[],"title":"CVE-2021-42697: Stack overflow while parsing User-Agent header with deeply nested comments • Akka HTTP","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released","name":"https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released","refsource":"MISC","tags":[],"title":"Akka HTTP 10.2.7 Released | Akka","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released","name":"https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released","refsource":"MISC","tags":[],"title":"Akka HTTP 10.1.15 Released | Akka","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-42697","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42697","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"42697","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"akka","cpe5":"http_server","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-42697","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://akka.io/blog/","refsource":"MISC","name":"https://akka.io/blog/"},{"refsource":"MISC","name":"https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html","url":"https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html"},{"refsource":"MISC","name":"https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released","url":"https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released"},{"refsource":"MISC","name":"https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released","url":"https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released"},{"refsource":"MISC","name":"http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html","url":"http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html"}]}},"nvd":{"publishedDate":"2021-11-02 22:15:00","lastModifiedDate":"2022-06-13 15:41:00","problem_types":["CWE-674"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"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:a:akka:http_server:*:*:*:*:*:*:*:*","versionStartIncluding":"10.2.0","versionEndExcluding":"10.2.7","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:akka:http_server:*:*:*:*:*:*:*:*","versionStartIncluding":"10.1.0","versionEndExcluding":"10.1.15","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"42697","Ordinal":"219190","Title":"CVE-2021-42697","CVE":"CVE-2021-42697","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"42697","Ordinal":"1","NoteData":"Akka HTTP 10.1.x and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"42697","Ordinal":"2","NoteData":"2021-11-02","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"42697","Ordinal":"3","NoteData":"2021-11-02","Type":"Other","Title":"Modified"}]}}}