CVE-2021-21311
vrana adminer
Published 11 Feb 2021 · updated 17 Jun 2026 · Analyzed
7.2 High · CVSS 3.1, NVD
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 29 Sept 2025, with a remediation deadline of 20 Oct 2025 for US federal agencies.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
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.
References
- github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351 · Patch
- github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf · Exploit, Third Party Advisory
- github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6 · Patch, Third Party Advisory
- lists.debian.org/debian-lts-announce/2021/03/msg00002.html · Mailing List, Third Party Advisory
- packagist.org/packages/vrana/adminer · Product, Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21311 · US Government Resource