CVE-2021-42665Public exploitNetwork attack vector

Authentication bypass via login query manipulation

Published Nov 5, 2021 · Updated Aug 4, 2024

SQL injection in Engineers Online Portal 1.0 allows remote attackers to bypass authentication through the username or password field. The referenced PoC submits a Boolean SQL tautology in either credential field to login.php, while the CVE description locates the form in index.php. Network access to the form is sufficient; the payload changes authentication-query logic and grants access without valid credentials.

CVSS severity9.8
Critical
EPSS probability4.95%
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 Engineers Online Portal 1.0 allows remote attackers to bypass authentication through the username or password field. The referenced PoC submits a Boolean SQL tautology in either credential field to login.php, while the CVE description locates the form in index.php. Network access to the form is sufficient; the payload changes authentication-query logic and grants access without valid credentials.

The record

CVE
CVE-2021-42665
Published
Nov 5, 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. Nov 5, 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

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS: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 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

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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