{"id":"CVE-2021-21087","published":"2021-04-15T13:54:29Z","modified":"2025-04-23T19:41:40Z","title":"ColdFusion Improper neutralization of web input during page generation could lead to arbitrary JavaScript execution in…","vendor":"Adobe","product":"ColdFusion","tier":"core","eol":null,"affectedVersions":[{"vendor":"Adobe","product":"ColdFusion","versions":[">= unspecified, <= 2016.16",">= unspecified, <= 2018.10",">= unspecified, <= 2021.0.0.323925",">= unspecified, <= None"]}],"description":{"text":"Adobe Coldfusion versions 2016 (update 16 and earlier), 2018 (update 10 and earlier) and 2021.0.0.323925 are affected by an Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability. An attacker could abuse this vulnerability to execute arbitrary JavaScript code in context of the current user. Exploitation of this issue requires user interaction.","provenance":"source","from":"CVE.org"},"summary":{"text":"Adobe ColdFusion, in the versions listed in the advisory, contains an improper neutralization of input during web page generation (cross-site scripting) flaw. An attacker can execute arbitrary JavaScript in the context of the current user by abusing the flaw, and this requires user interaction and network access with low privileges.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-11-01T01:04:07Z"},"cvss":{"score":5.4,"severity":"MEDIUM","version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.37095,"percentile":0.98518,"date":"2026-10-31","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2023-11-13","exploitedFirstSeen":"2023-11-13","ransomware":false,"evidence":[{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-13&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-13"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-14&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-14"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-15&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-15"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-16&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-16"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-17&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-17"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-19&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-19"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-23&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-23"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-25&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-25"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-27&host_type=src&vulnerability=cve-2021-21087","date":"2023-11-27"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2024-01-14&host_type=src&vulnerability=cve-2021-21087","date":"2024-01-14"}],"evidenceTotal":411,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"references":[{"url":"https://helpx.adobe.com/security/products/coldfusion/apsb21-16.html","tags":["x_refsource_MISC"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2021-8478","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-8478","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":{"nuclei":[{"id":"CVE-2021-21087","name":"Adobe ColdFusion - Cross-Site Scripting","severity":"medium","path":"http/cves/2021/CVE-2021-21087.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21087.yaml"}],"provenance":"source"},"exploitRefs":[],"flow":[],"timeline":[{"date":"2021-04-15","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2021-21087","provenance":"source"},{"date":"2023-11-13","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-11-13&host_type=src&vulnerability=cve-2021-21087","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":63.5,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1084 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.7,"detail":"percentile 0.9852"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 nuclei template"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":3.78,"detail":"base score 5.4"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}