CVE-2021-3239Public exploitNetwork attack vector

Unauthenticated code execution via login SQL injection

Published Feb 15, 2021 · Updated Aug 3, 2024

SQL injection in E-Learning System 1.0 allows remote attackers to execute code on the hosting web server through the administrator login. The admin/login.php handler passes the user_email field to User::userAuthentication without neutralizing SQL syntax, so a crafted predicate authenticates an attacker as an administrator. No prior account is required; administrator access permits a PHP file upload that provides a reverse shell and full server-side code execution.

CVSS severity9.8
Critical
EPSS probability18.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in E-Learning System 1.0 allows remote attackers to execute code on the hosting web server through the administrator login. The admin/login.php handler passes the user_email field to User::userAuthentication without neutralizing SQL syntax, so a crafted predicate authenticates an attacker as an administrator. No prior account is required; administrator access permits a PHP file upload that provides a reverse shell and full server-side code execution.

The record

CVE
CVE-2021-3239
Published
Feb 15, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application
T1505.003Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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