Is CVE-2021-42258 in the CISA KEV catalog?

Yes. CVE-2021-42258 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03, and has known ransomware campaign use.

What is the CVSS severity of CVE-2021-42258?

CVE-2021-42258 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-42258?

CVE-2021-42258 has an EPSS score of 73.27% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42258?

Upgrade billquick web suite to 22.0.9.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-42258

CRITICALCISA KEVEPSS 99th pctl

9.8

CVSS v3

NVD

Description

BQE BillQuick Web Suite 2018 through 2021 before 22.0.9.1 allows SQL injection for unauthenticated remote code execution, as exploited in the wild in October 2021 for ransomware installation. SQL injection can, for example, use the txtID (aka username) parameter. Successful exploitation can include the ability to execute arbitrary code as MSSQLSERVER$ via xp_cmdshell.

CWE-89SQL Injection

How to fix

Remediation Available

billquick web suiteNVD

Affected:>= 19, < 22.0.9.1Fixed in:22.0.9.1CVE-2021-42258derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

73.27%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

BQE BillQuick Web Suite SQL Injection Vulnerability

BQE BillQuick Web Suite contains an SQL injection vulnerability when accessing the username parameter that may allow for unauthenticated, remote code execution.

Apply updates per vendor instructions.

Remediation due: 2021-11-17

Associated with ransomware campaigns

References

Exploit1

huntress.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-89 (SQL Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3704	High	7.5	100%	-	Fix
CVE-2015-7297	High	7.5	100%	-	-
CVE-2024-29824	High	8.8	100%	KEV	Fix
CVE-2023-34362	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-7481	High	7.5	100%	KEV + Ransom	Fix
CVE-2024-29826	High	8.8	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-10.