CVE-2021-40543Public exploitNetwork attack vector

Unauthenticated database disclosure via unsanitized query parameters

Published Oct 11, 2021 · Updated Aug 4, 2024

SQL injection in OS4ED openSIS-Classic 8.0 allows remote attackers to read database contents through PasswordCheck.php requests. PasswordCheck.php inserts the usrid and prof_id GET parameters into a login_authentication query without adequate input sanitization. Access to the endpoint requires no authentication; crafted SQL expressions can extract stored information, including user records.

CVSS severity9.8
Critical
EPSS probability1.12%
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 OS4ED openSIS-Classic 8.0 allows remote attackers to read database contents through PasswordCheck.php requests. PasswordCheck.php inserts the usrid and prof_id GET parameters into a login_authentication query without adequate input sanitization. Access to the endpoint requires no authentication; crafted SQL expressions can extract stored information, including user records.

The record

CVE
CVE-2021-40543
Published
Oct 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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

Public exploit references

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Technologies

Your stack

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Your stack

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