CVE-2021-21311
KEVAdminer Server-Side Request Forgery Vulnerability
Description
Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information.
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.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NPublishedFeb 11, 2021
Last modifiedJun 17, 2026
Added to KEVSep 29, 2025
Remediation dueOct 20, 2025
References
- github.com/vrana/adminer/commit/ccd2374b0b12bd547417bf0dacdf153826c83351Patch
- github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdfExploitThird Party Advisory
- github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6PatchThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/03/msg00002.htmlMailing ListThird Party Advisory
- packagist.org/packages/vrana/adminerProductThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21311US Government Resource
0 recent articles mention this CVE
76
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 373 days
- CVSS
- 7.2 HIGH
- EPSS (30-day exploit probability)
- 98.5% · top 1% of all CVEs
- Weakness
- CWE-918
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.