CVE-2021-21311 (GCVE-0-2021-21311)

Vulnerability from cvelistv5 – Published: 2021-02-11 20:55 – Updated: 2025-10-21 23:35
VLAI CISA Shadowserver Previdian
Title
SSRF in adminer
Summary
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.
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-27 03:55 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7634 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
vrana adminer Affected: >= 4.0.0, < 4.7.9
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 948b89c9-8eae-4dc8-afaa-5e23fc0852d9

Vulnerability ID: CVE-2021-21311

Status: Confirmed

Status Updated: 2025-09-29 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2025-09-29
Asserted: 2025-09-29
Scope
Notes: KEV entry: Adminer Server-Side Request Forgery Vulnerability | Affected: Adminer / Adminer | Description: Adminer contains a server-side request forgery vulnerability that, when exploited, allows a remote attacker to obtain potentially sensitive information. | 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. | Due date: 2025-10-20 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6 ; https://nvd.nist.gov/vuln/detail/CVE-2021-21311
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-918
Feed CISA Known Exploited Vulnerabilities Catalog
Product Adminer
Due Date 2025-10-20
Date Added 2025-09-29
Vendorproject Adminer
Vulnerabilityname Adminer Server-Side Request Forgery Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 52b8562d-7207-40ae-ac56-dc7318fbb3e2

Vulnerability ID: CVE-2021-21311

Status: Confirmed

Status Updated: 2026-10-20 00:00 UTC

Exploited: Yes

Characteristics
Severity: 72.0
Timestamps
First Seen: 2026-09-21
Asserted: 2026-09-21
Last Seen: 2026-10-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Adminer / Adminer | Class: other-software | Severity: High (CVSS 7.2) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-10-20: 78
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 5
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class other-software
7D Avg 1
Vendor Adminer
30D Avg 1
90D Avg 0
Product Adminer
Cisa Kev yes
Connections 78
Observation Date 2026-10-20
Vulnerability Class CVSS
Vulnerability Score 7.2
Vulnerability Severity High
References
Created: 2026-10-21 08:50 UTC | Updated: 2026-10-22 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 40d342cf-ad9e-4492-9544-0e54e94a185c

Vulnerability ID: CVE-2021-21311

Status: Confirmed

Status Updated: 2026-06-01 10:41 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: SSRF in adminer | Affected: vrana / adminer | CVSS: 7.2 (HIGH) | EPSS: 0.90461 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title SSRF in adminer
Vendor vrana
Product adminer
Added Date 2026-06-01T10:41:16.891Z
Cvss Score 7.2
Epss Score 0.90461
Cvss Severity HIGH
Epss Percentile 0.99788
Used In Malware unknown
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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