CVE-2026-21840

LOWPre-NVD 3.13.1—
EchelonGraph scoreMEDIUM confidence

Score 3.1 from GitHub Security Advisory (severity: LOW) published 2026-07-15. a secondary CVSS source baseline 3.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
3.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.1Exploit: None knownExposed: 0

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

HCL BigFix Platform is affected by a user enumeration vulnerability which might allow an attacker, through careful system control and response time monitoring, to perform some level of user enumeration for the BigFix service.

CVSS v3
3.1
EG Score
3.1(medium)
EG Risk
14(Track)
EG Risk 14/100SSVC: Track

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
Severity31% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

References (1)

Vendor Advisories for CVE-2026-21840(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 49× 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.

  1. 2026-08-30 03:59 UTCEG score recompute
  2. 2026-08-30 03:59 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-26 13:42 UTCEG score recompute
  8. 2026-08-26 13:42 UTCGHSA enrichment
  9. 2026-08-25 13:48 UTCEPSS rescore
  10. 2026-08-23 17:54 UTCEG score recompute
  11. 2026-08-23 17:54 UTCGHSA enrichment
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-21 23:49 UTCEPSS rescore
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-20 22:15 UTCEG score recompute
  16. 2026-08-20 22:15 UTCGHSA enrichment
  17. 2026-08-19 17:03 UTCEPSS rescore
  18. 2026-08-18 13:48 UTCEPSS rescore
  19. 2026-08-18 02:35 UTCEG score recompute
  20. 2026-08-18 02:35 UTCGHSA enrichment
  21. 2026-08-17 13:47 UTCEPSS rescore
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 05:22 UTCEG score recompute
  25. 2026-08-15 05:22 UTCGHSA enrichment
Show 54 more
  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-12 13:50 UTCEPSS rescore
  4. 2026-08-12 09:42 UTCEG score recompute
  5. 2026-08-12 09:42 UTCGHSA enrichment
  6. 2026-08-11 13:42 UTCEPSS rescore
  7. 2026-08-11 00:00 UTCEPSS rescore
  8. 2026-08-09 14:02 UTCEG score recompute
  9. 2026-08-09 14:02 UTCGHSA enrichment
  10. 2026-08-09 13:46 UTCEPSS rescore
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-06 18:23 UTCEG score recompute
  13. 2026-08-06 18:23 UTCGHSA enrichment
  14. 2026-08-06 13:46 UTCEPSS rescore
  15. 2026-08-05 19:17 UTCEPSS rescore
  16. 2026-08-04 15:10 UTCEPSS rescore
  17. 2026-08-04 10:38 UTCEPSS rescore
  18. 2026-08-03 22:43 UTCEG score recompute
  19. 2026-08-03 22:43 UTCGHSA enrichment
  20. 2026-08-03 10:35 UTCEPSS rescore
  21. 2026-08-02 02:26 UTCEPSS rescore
  22. 2026-08-01 04:15 UTCEPSS rescore
  23. 2026-08-01 03:03 UTCEG score recompute
  24. 2026-08-01 03:03 UTCGHSA enrichment
  25. 2026-07-30 01:30 UTCEPSS rescore
  26. 2026-07-29 07:22 UTCEG score recompute
  27. 2026-07-29 07:22 UTCGHSA enrichment
  28. 2026-07-27 14:13 UTCEPSS rescore
  29. 2026-07-26 11:40 UTCEG score recompute
  30. 2026-07-26 11:39 UTCGHSA enrichment
  31. 2026-07-25 14:17 UTCEPSS rescore
  32. 2026-07-25 14:17 UTCEPSS rescore
  33. 2026-07-24 14:17 UTCEPSS rescore
  34. 2026-07-23 14:18 UTCEPSS rescore
  35. 2026-07-23 14:18 UTCEPSS rescore
  36. 2026-07-23 03:06 UTCEG score recompute
  37. 2026-07-22 14:08 UTCEPSS rescore
  38. 2026-07-21 15:24 UTCEPSS rescore
  39. 2026-07-21 15:24 UTCEPSS rescore
  40. 2026-07-20 17:08 UTCEPSS rescore
  41. 2026-07-19 14:31 UTCEPSS rescore
  42. 2026-07-19 14:31 UTCEPSS rescore
  43. 2026-07-19 02:29 UTCEPSS rescore
  44. 2026-07-19 02:28 UTCEPSS rescore
  45. 2026-07-18 10:04 UTCEPSS rescore
  46. 2026-07-18 10:04 UTCEPSS rescore
  47. 2026-07-17 07:12 UTCEG score recompute
  48. 2026-07-17 07:12 UTCGHSA enrichment
  49. 2026-07-16 17:03 UTCEPSS rescore
  50. 2026-07-16 17:03 UTCEPSS rescore
  51. 2026-07-15 16:57 UTCEPSS rescore
  52. 2026-07-15 16:57 UTCEPSS rescore
  53. 2026-07-14 22:01 UTCEG score recompute
  54. 2026-07-14 22:00 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-21840?
CVE-2026-21840 is a low vulnerability published on July 14, 2026. HCL BigFix Platform is affected by a user enumeration vulnerability which might allow an attacker, through careful system control and response time monitoring, to perform some level of user enumeration for the BigFix service.
When was CVE-2026-21840 disclosed?
CVE-2026-21840 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21840 actively exploited?
CVE-2026-21840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.0% of all scored CVEs.
What is the CVSS score of CVE-2026-21840?
CVE-2026-21840 has a CVSS v3 base score of 3.1 (NVD).
How do I remediate CVE-2026-21840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21840, 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

Explore the affected products and dependency analysis for CVE-2026-21840

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