CVE-2021-40309Public exploitNetwork attack vector

Authenticated SQL injection via attendance parameter

Published Sep 24, 2021 · Updated Aug 4, 2024

SQL injection in OS4Ed OpenSIS 8.0 allows remote authenticated users to execute SQL commands via the Take Attendance HTTP request. The cp_id_miss_attn parameter in TakeAttendance.php is inserted into a database query without adequate neutralization, allowing crafted values to alter query execution. Access requires a user authorized for Take Attendance; successful exploitation can disclose, modify, or delete database information and affect application availability.

CVSS severity8.8
High
EPSS probability1.82%
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 8.0 allows remote authenticated users to execute SQL commands via the Take Attendance HTTP request. The cp_id_miss_attn parameter in TakeAttendance.php is inserted into a database query without adequate neutralization, allowing crafted values to alter query execution. Access requires a user authorized for Take Attendance; successful exploitation can disclose, modify, or delete database information and affect application availability.

The record

CVE
CVE-2021-40309
Published
Sep 24, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
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

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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