CVE-2021-42258Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via login SQL injection

Published Oct 22, 2021 · Updated Oct 21, 2025

SQL injection in BQE BillQuick Web Suite 2018 through 2021 before 22.0.9.1 allows remote attackers to execute code without authentication. The login handler concatenates the txtID username into an MSSQL query, enabling stacked queries against deployments that use the sa database account. With sa access, attackers can re-enable xp_cmdshell, run PowerShell as MSSQLSERVER$, read billing data, and install ransomware.

CVSS severity9.8
Critical
EPSS probability74.43%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in BQE BillQuick Web Suite 2018 through 2021 before 22.0.9.1 allows remote attackers to execute code without authentication. The login handler concatenates the txtID username into an MSSQL query, enabling stacked queries against deployments that use the sa database account. With sa access, attackers can re-enable xp_cmdshell, run PowerShell as MSSQLSERVER$, read billing data, and install ransomware.

The record

CVE
CVE-2021-42258
Published
Oct 22, 2021
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1059.001, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2021Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
  3. Oct 21, 2025Record 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
9.8CISA-ADPCVSS: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.

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
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1059.001PowerShell
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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