Threats / BQE / CVE-2021-42258
CVE-2021-42258
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
BQE BillQuick Web Suite vulnerability
BQE BillQuick Web Suite contains an unauthenticated SQL injection vulnerability in the username parameter that enables remote code execution.
Verdict
Today item, not a backlog item.
SQL injection in an unauthenticated endpoint of widely-deployed billing software creates a direct path to system compromise. High EPSS score and active exploitation in ransomware campaigns reflect severe real-world risk.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.73269 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: BQE, BillQuick Web Suite. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-89 SQL Injection — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious SQL payload in the username parameter and send it to the unauthenticated login endpoint.
Business
Attacker gains unauthorized database access without credentials, bypassing authentication controls.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute database queries to extract sensitive data or escalate privileges within the application context.
Business
Customer financial records, invoices, and payment information are exposed or manipulated.
3
Lateral reach — past segmentation narrative 3
Attacker
I leverage database functionality to achieve remote code execution on the underlying server.
Business
Attacker gains full system control and can deploy ransomware, exfiltrate data, or establish persistence.
4
Data at risk — exfiltration narrative 4
Attacker
I encrypt critical business data and demand ransom while threatening public disclosure.
Business
Operations halt, revenue stops, and the organization faces extortion, regulatory fines, and reputational damage.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05