{"id":"CVE-2021-1405","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-1405","generatedAt":"2026-10-27T22:31:53.844Z","title":"A vulnerability in the email parsing module in Clam AntiVirus (ClamAV) Software version 0.103.1 and all prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device.","description":"A vulnerability in the email parsing module in Clam AntiVirus (ClamAV) Software version 0.103.1 and all prior versions could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to improper variable initialization that may result in an NULL pointer read. An attacker could exploit this vulnerability by sending a crafted email to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process crash, resulting in a denial of service condition.","published":"2021-04-08T05:15:13.000Z","lastModified":"2026-06-17T03:31:42.000Z","status":"Modified","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-120","CWE-909"],"affected":["clamav/clamav","debian/debian linux"],"epss":{"score":0.03031,"percentile":0.87397,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (3.03%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html","tags":["Release Notes","Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/04/msg00012.html","tags":["Mailing List","Third Party Advisory"],"source":"psirt@cisco.com"},{"url":"https://security.gentoo.org/glsa/202104-07","tags":["Third Party Advisory"],"source":"psirt@cisco.com"},{"url":"https://blog.clamav.net/2021/04/clamav-01032-security-patch-release.html","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/04/msg00012.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202104-07","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-1405","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}