{"id":"CVE-2019-1831","published":"2019-04-18T01:20:26Z","modified":"2024-11-19T19:10:48Z","title":"Cisco Email Security Appliance Content Filter Bypass Vulnerability","vendor":"Cisco","product":"Cisco Email Security Appliance (ESA)","tier":"core","eol":null,"affectedVersions":[{"vendor":"Cisco","product":"Cisco Email Security Appliance (ESA)","versions":["11.1.2-023"]}],"description":{"text":"A vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured content filters on the device. The vulnerability is due to improper input validation of the email body. An attacker could exploit this vulnerability by inserting specific character strings in the message. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":5.8,"severity":"MEDIUM","version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.01647,"percentile":0.76375,"date":"2026-10-28","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":0,"pulses":[],"provenance":"machine"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-esa-filter-bypass","tags":["vendor-advisory","x_refsource_CISCO"]},{"url":"http://www.securityfocus.com/bid/108021","tags":["vdb-entry","x_refsource_BID"]}],"techniques":[{"id":"T1036","name":"Masquerading","tactics":["stealth"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 2)","mappingType":"primary_impact","evidence":[],"confidence":"high"},{"id":"T1566","name":"Phishing","tactics":["initial-access"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 2)","mappingType":"secondary_impact","evidence":[],"confidence":"high"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2019-10388","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-10388","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"primary","techniques":["T1036"],"provenance":"source"},{"stage":"secondary","techniques":["T1566"],"provenance":"source"}],"timeline":[{"date":"2019-04-18","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2019-1831","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":19.3,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":15.28,"detail":"percentile 0.7638"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":4.06,"detail":"base score 5.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}