{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2021-42697","sourceIdentifier":"cve@mitre.org","published":"2021-11-02T22:15:08.957","lastModified":"2026-06-17T04:09:58.213","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","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."},{"lang":"es","value":"Akka HTTP 10.1.x antes de 10.1.15 y 10.2.x antes de 10.2.7 pueden encontrar agotamiento de la pila mientras analizan las cabeceras HTTP, lo que permite a un atacante remoto llevar a cabo un ataque de denegación de servicio mediante el envío de una cabecera User-Agent con comentarios profundamente anidados"}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","baseScore":5.0,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":10.0,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-674"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:akka:http_server:*:*:*:*:*:*:*:*","versionStartIncluding":"10.1.0","versionEndExcluding":"10.1.15","matchCriteriaId":"A9CC0F38-FFB5-4018-876D-6A3942B897D8"},{"vulnerable":true,"criteria":"cpe:2.3:a:akka:http_server:*:*:*:*:*:*:*:*","versionStartIncluding":"10.2.0","versionEndExcluding":"10.2.7","matchCriteriaId":"26F742DD-9B4F-401A-B367-99F5A9050A71"}]}]}],"references":[{"url":"http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html","source":"cve@mitre.org","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://akka.io/blog/","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released","source":"cve@mitre.org","tags":["Release Notes","Vendor Advisory"]},{"url":"https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released","source":"cve@mitre.org","tags":["Release Notes","Vendor Advisory"]},{"url":"https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://akka.io/blog/","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Vendor Advisory"]},{"url":"https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Vendor Advisory"]},{"url":"https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]}]}}