CVE-2021-21311

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.985 · 100 %ileexploit · PoCEURUUS
grimoire priorityP0 · Act now
Exploitable?
Yes · in the wild
CISA KEV · 3 exploits · PoC
Likely / severe?
98.5% (100th) EPSS
CVSS 6.4 · medium
Is it mine?
5 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · nvd

added 2025-09-29remediate by 2025-10-20

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.

EPSS · scored 2026-10-27

Adminer Server-Side Request Forgery Vulnerability

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.2
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–7.2

v2.06.4mediumAV:N/AC:L/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 4.9
v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 2.7
v3.17.2highAV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU
v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · ENISA EU
v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 3.9 · impact 2.7
v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:Hsecondary · OSV
v3.17.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:Hsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-918USCWE-918USCWE-918US
04

exploits (3)

Public proof-of-concept and weaponised exploit code.

05

affected products (5)

Products and version ranges known to be affected.

06

advisories (1)

Vendor and ecosystem advisories describing this.

  • GHSA-x5r2-hj5c-8jx6SSRF in adminer2021-02-11ghsa · osvUS

    ### Impact Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. ### Patches Patched by ccd2374b, included in version [4.7.9](https://github.com/vrana/adminer/releases/tag/v4.7.9). ### Workarounds * Use a single driver version (e.g. `adminer-mysql.php`). * Protect access to Adminer also by other means, e.g. by HTTP password, IP address limiting or by OTP [plugin](https://www.adminer.org/plugins/). ### References https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf ### For more information If you have any questions or comments about this advisory: * Comment at ccd2374b.

07

also known as (5)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdosvNVDCVE.orgMITRE
published 2021-02-11modified 2026-06-17
09

references (19)

External citations — patches, advisories, analysis.

scry

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