{"id":"CVE-2021-21311","published":"2021-02-11T21:15:13Z","modified":"2026-06-17T03:35:16Z","title":"Adminer Server-Side Request Forgery Vulnerability","vendor":"Adminer","product":"Adminer","tier":"core","eol":null,"description":{"text":"Adminer is an open-source database management in a single PHP file. In adminer from version 4.0.0 and before 4.7.9 there is a server-side request forgery vulnerability. Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. This is fixed in version 4.7.9.","provenance":"source","from":"NVD"},"summary":{"text":"Adminer, an open-source single-file PHP database management tool, contains a server-side request forgery flaw in versions from 4.0.0 before 4.7.9, affecting deployments that use the bundled-drivers build (such as adminer.php). An attacker with network access can make the server issue requests to destinations of their choosing, without authentication or user interaction, and no non-default configuration is required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-31T05:10:09Z"},"cvss":{"score":7.2,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.98464,"percentile":0.99919,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2025-09-29","dueDate":"2025-10-20","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6 ; https://nvd.nist.gov/vuln/detail/CVE-2021-21311","provenance":"source"},"vulncheckKev":{"dateAdded":"2022-05-04","exploitedFirstSeen":"2022-05-04","ransomware":false,"evidence":[{"url":"https://cloud.google.com/blog/topics/threat-intelligence/cloud-metadata-abuse-unc2903","date":"2022-05-04"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2025-09-29"},{"url":"https://www.recordedfuture.com/blog/september-2025-cve-landscape","date":"2025-10-17"},{"url":"https://www.rapid7.com/cdn/assets/bltbd2f1cd70f9e3e7f/691360b9c91291146f1a5308/threat-landscape-report-q3-2025.pdf","date":"2025-11-12"},{"url":"https://www.loginsoft.com/reports/annually/vulnerability-intelligence-report-2025","date":"2026-01-20"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-21&host_type=src&vulnerability=cve-2021-21311","date":"2026-09-21"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-22&host_type=src&vulnerability=cve-2021-21311","date":"2026-09-22"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-23&host_type=src&vulnerability=cve-2021-21311","date":"2026-09-23"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-24&host_type=src&vulnerability=cve-2021-21311","date":"2026-09-24"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2026-09-25&host_type=src&vulnerability=cve-2021-21311","date":"2026-09-25"}],"evidenceTotal":26,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-918","name":"Server-Side Request Forgery"}],"references":[{"url":"https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351","tags":["Patch"]},{"url":"https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf","tags":["Exploit","Third Party Advisory"]},{"url":"https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6","tags":["Patch","Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html","tags":["Mailing List","Third Party Advisory"]},{"url":"https://packagist.org/packages/vrana/adminer","tags":["Product","Third Party Advisory"]},{"url":"https://github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351","tags":["Patch"]},{"url":"https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf","tags":["Exploit","Third Party Advisory"]},{"url":"https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6","tags":["Patch","Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/03/msg00002.html","tags":["Mailing List","Third Party Advisory"]},{"url":"https://packagist.org/packages/vrana/adminer","tags":["Product","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21311","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: unauthenticated SSRF against public-facing web app","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"there is a server-side request forgery vulnerability","start":115,"end":167}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1090","name":"Proxy","tactics":["command-and-control"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: SSRF proxies requests through the vulnerable server","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Adminer is an open-source database management in a single PHP file","start":0,"end":66}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[{"ecosystem":"Packagist","package":"vrana/adminer","vulnerableRanges":["<4.7.9"],"patched":["4.7.9"],"from":["GHSA-x5r2-hj5c-8jx6"],"provenance":"source"}],"advisories":[{"id":"GHSA-x5r2-hj5c-8jx6","url":"https://github.com/advisories/GHSA-x5r2-hj5c-8jx6","severity":"HIGH","ecosystem":"Packagist","package":"vrana/adminer","vulnerableRanges":["<4.7.9"],"patched":["4.7.9"],"provenance":"source","from":"GHSA"}],"euvd":{"id":"EUVD-2021-0576","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-0576","exploited":true,"exploitedSince":"2025-09-29","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":3,"skipped":0,"earliest":"2022-02-14","earliestUrl":"https://github.com/llhala/CVE-2021-21311","repos":[{"name":"llhala/CVE-2021-21311","url":"https://github.com/llhala/CVE-2021-21311","stars":8,"created":"2022-02-14"},{"name":"omoknooni/CVE-2021-21311","url":"https://github.com/omoknooni/CVE-2021-21311","stars":3,"created":"2023-06-12"},{"name":"Sudo-WP/sudowp-adminer","url":"https://github.com/Sudo-WP/sudowp-adminer","stars":1,"created":"2026-01-24"}]},"nuclei":[{"id":"CVE-2021-21311","name":"Adminer <4.7.9 - Server-Side Request Forgery","severity":"high","path":"http/cves/2021/CVE-2021-21311.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21311.yaml"}],"first":{"date":"2022-02-14","source":"PoC-in-GitHub","url":"https://github.com/llhala/CVE-2021-21311"},"provenance":"source"},"exploitRefs":["https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1090"],"provenance":"ai"}],"timeline":[{"date":"2021-02-11","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21311","provenance":"source"},{"date":"2022-02-14","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/llhala/CVE-2021-21311","provenance":"source"},{"date":"2022-05-04","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://cloud.google.com/blog/topics/threat-intelligence/cloud-metadata-abuse-unc2903","provenance":"source"},{"date":"2025-09-29","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2025-09-29","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-0576","provenance":"source"}],"speed":{"daysToPublicExploit":368,"firstExploitFrom":"PoC-in-GitHub","daysToKev":1691},"priority":{"score":68.0,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1641 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.98,"detail":"percentile 0.9992"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 3 PoC-in-GitHub repos; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.04,"detail":"base score 7.2"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"packageHistory":[{"cve":"CVE-2021-43008","published":"2022-04-05","fixed":"4.6.3","kev":false},{"cve":"CVE-2018-7667","published":"2018-03-05","fixed":"4.7.8","kev":false},{"cve":"CVE-2020-35572","published":"2021-02-09","fixed":"4.7.9","kev":false},{"cve":"CVE-2021-21311","published":"2021-02-11","fixed":"4.7.9","kev":true},{"cve":"CVE-2021-29625","published":"2021-05-19","fixed":"4.8.1","kev":false,"link":{"from":"CVE-2021-21311","to":"CVE-2021-29625","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Packagist:vrana/adminer","fromFixed":"4.7.9","toFixed":"4.8.1","daysApart":97}]}},{"cve":"CVE-2026-25892","published":"2026-02-09","fixed":"5.4.2","kev":false}],"package":"Packagist:vrana/adminer"}}