CVE-2021-42258

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 74%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
74%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

October 22, 2021

Last Modified

November 10, 2025

Advisory Details (2)

Auto-updated Sep 3, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42258
generic🔴 Active Exploitation

Hackers Are Exploiting a Vulnerability in Billing Software | Huntress

https://www.huntress.com/blog/threat-advisory-hackers-are-exploiting-a-vulnerability-in-popular-billing-software-to-deploy-ransomware

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 52× in last 7d / 232× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 734 total refreshes for this CVE.

  1. 2026-09-08 11:46 UTCGHSA enrichment
  2. 2026-09-08 07:48 UTCGHSA enrichment
  3. 2026-09-08 03:51 UTCGHSA enrichment
  4. 2026-09-07 23:53 UTCGHSA enrichment
  5. 2026-09-07 19:56 UTCGHSA enrichment
  6. 2026-09-07 15:59 UTCGHSA enrichment
  7. 2026-09-07 12:01 UTCGHSA enrichment
  8. 2026-09-07 08:04 UTCGHSA enrichment
  9. 2026-09-07 04:05 UTCGHSA enrichment
  10. 2026-09-07 00:08 UTCGHSA enrichment
  11. 2026-09-06 20:08 UTCGHSA enrichment
  12. 2026-09-06 16:11 UTCEG score recompute
  13. 2026-09-06 16:11 UTCGHSA enrichment
  14. 2026-09-06 13:45 UTCEPSS rescore
  15. 2026-09-06 12:13 UTCGHSA enrichment
  16. 2026-09-06 08:14 UTCGHSA enrichment
  17. 2026-09-06 04:17 UTCGHSA enrichment
  18. 2026-09-06 00:21 UTCGHSA enrichment
  19. 2026-09-05 20:22 UTCGHSA enrichment
  20. 2026-09-05 16:26 UTCEG score recompute
  21. 2026-09-05 16:26 UTCGHSA enrichment
  22. 2026-09-05 15:25 UTCEPSS rescore
  23. 2026-09-05 12:27 UTCGHSA enrichment
  24. 2026-09-05 08:28 UTCGHSA enrichment
  25. 2026-09-05 04:31 UTCGHSA enrichment
Show 75 more
  1. 2026-09-05 00:33 UTCGHSA enrichment
  2. 2026-09-04 20:36 UTCGHSA enrichment
  3. 2026-09-04 17:38 UTCCISA KEV update
  4. 2026-09-04 16:39 UTCEG score recompute
  5. 2026-09-04 16:39 UTCGHSA enrichment
  6. 2026-09-04 13:57 UTCEPSS rescore
  7. 2026-09-04 12:43 UTCGHSA enrichment
  8. 2026-09-04 08:46 UTCGHSA enrichment
  9. 2026-09-04 04:48 UTCGHSA enrichment
  10. 2026-09-04 00:48 UTCGHSA enrichment
  11. 2026-09-03 20:48 UTCGHSA enrichment
  12. 2026-09-03 16:49 UTCGHSA enrichment
  13. 2026-09-03 12:50 UTCGHSA enrichment
  14. 2026-09-03 08:53 UTCGHSA enrichment
  15. 2026-09-03 04:54 UTCGHSA enrichment
  16. 2026-09-03 00:57 UTCGHSA enrichment
  17. 2026-09-02 21:00 UTCGHSA enrichment
  18. 2026-09-02 17:33 UTCCISA KEV update
  19. 2026-09-02 17:01 UTCGHSA enrichment
  20. 2026-09-02 13:02 UTCGHSA enrichment
  21. 2026-09-02 09:04 UTCGHSA enrichment
  22. 2026-09-02 05:07 UTCGHSA enrichment
  23. 2026-09-02 01:08 UTCGHSA enrichment
  24. 2026-09-01 21:10 UTCGHSA enrichment
  25. 2026-09-01 17:13 UTCEG score recompute
  26. 2026-09-01 17:13 UTCGHSA enrichment
  27. 2026-09-01 13:50 UTCEPSS rescore
  28. 2026-09-01 13:14 UTCGHSA enrichment
  29. 2026-09-01 09:16 UTCGHSA enrichment
  30. 2026-09-01 05:18 UTCGHSA enrichment
  31. 2026-09-01 01:20 UTCGHSA enrichment
  32. 2026-08-31 21:21 UTCGHSA enrichment
  33. 2026-08-31 17:24 UTCGHSA enrichment
  34. 2026-08-31 14:19 UTCCISA KEV update
  35. 2026-08-31 13:26 UTCGHSA enrichment
  36. 2026-08-31 09:27 UTCGHSA enrichment
  37. 2026-08-31 05:28 UTCGHSA enrichment
  38. 2026-08-31 01:32 UTCGHSA enrichment
  39. 2026-08-30 21:35 UTCEG score recompute
  40. 2026-08-30 21:35 UTCGHSA enrichment
  41. 2026-08-30 19:14 UTCEPSS rescore
  42. 2026-08-30 19:14 UTCEPSS rescore
  43. 2026-08-30 17:38 UTCGHSA enrichment
  44. 2026-08-30 13:41 UTCGHSA enrichment
  45. 2026-08-30 09:44 UTCGHSA enrichment
  46. 2026-08-30 05:47 UTCGHSA enrichment
  47. 2026-08-30 01:49 UTCEG score recompute
  48. 2026-08-30 01:49 UTCGHSA enrichment
  49. 2026-08-30 01:19 UTCEPSS rescore
  50. 2026-08-29 21:52 UTCGHSA enrichment
  51. 2026-08-29 17:55 UTCGHSA enrichment
  52. 2026-08-29 13:57 UTCGHSA enrichment
  53. 2026-08-29 09:59 UTCGHSA enrichment
  54. 2026-08-29 06:02 UTCGHSA enrichment
  55. 2026-08-29 02:04 UTCGHSA enrichment
  56. 2026-08-28 22:05 UTCEG score recompute
  57. 2026-08-28 22:05 UTCGHSA enrichment
  58. 2026-08-28 21:37 UTCEPSS rescore
  59. 2026-08-28 18:06 UTCGHSA enrichment
  60. 2026-08-28 14:08 UTCGHSA enrichment
  61. 2026-08-28 10:11 UTCGHSA enrichment
  62. 2026-08-28 06:13 UTCGHSA enrichment
  63. 2026-08-28 02:13 UTCGHSA enrichment
  64. 2026-08-27 22:15 UTCGHSA enrichment
  65. 2026-08-27 18:18 UTCGHSA enrichment
  66. 2026-08-27 17:22 UTCCISA KEV update
  67. 2026-08-27 14:21 UTCGHSA enrichment
  68. 2026-08-27 10:23 UTCGHSA enrichment
  69. 2026-08-27 06:25 UTCGHSA enrichment
  70. 2026-08-27 02:16 UTCGHSA enrichment
  71. 2026-08-26 22:19 UTCGHSA enrichment
  72. 2026-08-26 18:22 UTCEG score recompute
  73. 2026-08-26 18:22 UTCGHSA enrichment
  74. 2026-08-26 17:41 UTCCISA KEV update
  75. 2026-08-26 14:43 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitauxiliary/gather/billquick_txtid_sqli✓ verified
    First seen Oct 22, 2021

    BillQuick Web Suite txtID SQLi

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-42258.yaml
    First seen Jan 1, 2021

    BillQuick Web Suite SQL Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2021-42258?
CVE-2021-42258 is a critical vulnerability published on October 22, 2021. 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…
When was CVE-2021-42258 disclosed?
CVE-2021-42258 was first published in the National Vulnerability Database on October 22, 2021, with the most recent update on November 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-42258 actively exploited?
Yes. CISA added CVE-2021-42258 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting BQE BillQuick Web Suite. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-42258?
CVE-2021-42258 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2021-42258?
CVE-2021-42258 affects BQE BillQuick Web Suite. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-42258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42258, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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