{"id":"CVE-2021-31987","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-31987","generatedAt":"2026-10-28T02:58:50.522Z","title":"A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.","description":"A user controlled parameter related to SMTP test functionality is not correctly validated making it possible to bypass blocked network recipients.","published":"2021-10-05T22:15:08.000Z","lastModified":"2026-06-17T03:52:38.000Z","status":"Modified","sourceIdentifier":"product-security@axis.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-1286"],"affected":["axis/axis os","axis/axis os 2016","axis/axis os 2018","axis/axis os 2020"],"epss":{"score":0.00894,"percentile":0.59216,"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 (0.89%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf","tags":["Vendor Advisory"],"source":"product-security@axis.com"},{"url":"https://www.axis.com/files/tech_notes/CVE-2021-31987.pdf","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-31987","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."}