{"id":"CVE-2020-3548","state":"PUBLISHED","title":"Cisco Email Security Appliance Denial Of Service Vulnerability","description":"A vulnerability in the Transport Layer Security (TLS) protocol implementation of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition.\r\nThe vulnerability is due to inefficient processing of incoming TLS traffic. An attacker could exploit this vulnerability by sending a series of crafted TLS packets to an affected device. A successful exploit could allow the attacker to trigger a prolonged state of high CPU utilization. The affected device would still be operative, but response time and overall performance may be degraded.There are no workarounds that address this vulnerability.","publishedAt":"2024-11-18T15:53:40.744Z","updatedAt":"2024-11-18T16:32:04.999Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:X/RC:X/E:X","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Secure Email"],"affected":[{"vendor":"Cisco","product":"Cisco Secure Email","versions":[{"version":"N/A","status":"affected"}]}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-tls-dos-xW53TBhb"],"weaknesses":["CWE-407"],"ingestedAt":"2026-10-29T19:47:29.373Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/3xxx/CVE-2020-3548.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2020-3548","state":"PUBLISHED","datePublished":"2024-11-18T15:53:40.744Z","dateUpdated":"2024-11-18T16:32:04.999Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2019-12-12T00:00:00.000Z"},"containers":{"cna":{"title":"Cisco Email Security Appliance Denial Of Service Vulnerability","descriptions":[{"lang":"en","value":"A vulnerability in the Transport Layer Security (TLS) protocol implementation of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition.\r\nThe vulnerability is due to inefficient processing of incoming TLS traffic. An attacker could exploit this vulnerability by sending a series of crafted TLS packets to an affected device. A successful exploit could allow the attacker to trigger a prolonged state of high CPU utilization. The affected device would still be operative, but response time and overall performance may be degraded.There are no workarounds that address this vulnerability."}],"affected":[{"vendor":"Cisco","product":"Cisco Secure Email","versions":[{"version":"N/A","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-tls-dos-xW53TBhb","name":"cisco-sa-esa-tls-dos-xW53TBhb"}],"metrics":[{"format":"cvssV3_1","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:X/RC:X/E:X","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"Inefficient Algorithmic Complexity","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2024-11-18T15:53:40.744Z"},"exploits":[{"lang":"en","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"source":{"advisory":"cisco-sa-esa-tls-dos-xW53TBhb","discovery":"INTERNAL","defects":["CSCvu35999"]}},"adp":[{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"cisco","product":"secure_email","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThanOrEqual":"13.5.1-277","versionType":"custom"}],"cpes":["cpe:2.3:a:cisco:secure_email:-:*:*:*:*:*:*:*"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-11-18T16:30:29.514984Z","id":"CVE-2020-3548","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-11-18T16:32:04.999Z"}}]}}}