CVE-2021-4240

LOWNVD 2.62.6—
EchelonGraph scoreMEDIUM confidence

This low-severity CVE scores 2.6 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
2.6
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 2.6Exploit: NoneExposed: 0

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

A vulnerability, which was classified as problematic, was found in phpservermon. This affects the function generatePasswordResetToken of the file src/psm/Service/User.php. The manipulation leads to use of predictable algorithm in random number generator. The exploit has been disclosed to the public and may be used. The name of the patch is 3daa804d5f56c55b3ae13bfac368bb84ec632193. It is recommended to apply a patch to fix this issue. The identifier VDB-213717 was assigned to this vulnerability.

CVSS v3
2.6
EG Score
2.6(medium)
EPSS
52.9%
KEV
Not listed

Published

November 15, 2022

Last Modified

November 21, 2024

References (6)

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
phpservermon/phpservermonv3.1.0 ... v3.5.2 (18 versions)3.6.0—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 46× 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. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-20 17:05 UTCEPSS rescore
  5. 2026-07-19 14:29 UTCEPSS rescore
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  9. 2026-07-16 17:00 UTCEPSS rescore
  10. 2026-07-16 17:00 UTCEPSS rescore
  11. 2026-07-16 15:19 UTCOSV refresh
  12. 2026-07-15 16:55 UTCEPSS rescore
  13. 2026-07-15 01:58 UTCEPSS rescore
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  15. 2026-07-13 22:27 UTCEPSS rescore
  16. 2026-07-12 05:44 UTCEPSS rescore
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  1. 2026-07-06 02:21 UTCEPSS rescore
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  4. 2026-07-04 06:29 UTCEPSS rescore
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  8. 2026-06-29 14:04 UTCEPSS rescore
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  10. 2026-06-28 14:05 UTCEPSS rescore
  11. 2026-06-28 13:31 UTCOSV refresh
  12. 2026-06-28 04:54 UTCEPSS rescore
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  14. 2026-06-27 03:07 UTCEPSS rescore
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  20. 2026-06-23 21:31 UTCEPSS rescore
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  22. 2026-06-22 14:24 UTCEPSS rescore
  23. 2026-06-21 14:55 UTCEPSS rescore
  24. 2026-06-21 01:58 UTCEPSS rescore
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  26. 2026-06-19 19:24 UTCEPSS rescore
  27. 2026-06-19 19:24 UTCEPSS rescore
  28. 2026-06-18 17:51 UTCEPSS rescore
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  30. 2026-06-17 17:51 UTCEPSS rescore
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  36. 2026-06-13 22:58 UTCEPSS rescore
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  38. 2026-06-12 23:10 UTCEPSS rescore
  39. 2026-06-11 13:58 UTCEPSS rescore
  40. 2026-06-11 01:09 UTCOSV refresh
  41. 2026-06-10 22:16 UTCEPSS rescore
  42. 2026-06-10 13:20 UTCEPSS rescore
  43. 2026-06-08 14:15 UTCEPSS rescore
  44. 2026-06-08 14:15 UTCEPSS rescore
  45. 2026-06-08 14:15 UTCEPSS rescore
  46. 2026-06-07 15:23 UTCEPSS rescore
  47. 2026-06-07 15:23 UTCEPSS rescore
  48. 2026-06-06 13:46 UTCEPSS rescore
  49. 2026-06-06 13:46 UTCEPSS rescore
  50. 2026-06-05 22:45 UTCEPSS rescore
  51. 2026-06-05 22:45 UTCEPSS rescore
  52. 2026-06-05 06:09 UTCEPSS rescore
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  54. 2026-06-04 13:11 UTCEPSS rescore
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  58. 2026-06-01 13:50 UTCEPSS rescore
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  60. 2026-05-31 22:29 UTCEPSS rescore
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  63. 2026-05-29 13:42 UTCEPSS rescore
  64. 2026-05-28 13:43 UTCEPSS rescore
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  66. 2026-05-27 13:39 UTCEPSS rescore
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  68. 2026-05-26 13:43 UTCEPSS rescore
  69. 2026-05-26 13:42 UTCEPSS rescore
  70. 2026-05-26 07:17 UTCEPSS rescore
  71. 2026-05-26 07:17 UTCEPSS rescore
  72. 2026-05-25 12:00 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-4240?
CVE-2021-4240 is a low vulnerability published on November 15, 2022. A vulnerability, which was classified as problematic, was found in phpservermon. This affects the function generatePasswordResetToken of the file src/psm/Service/User.php. The manipulation leads to use of predictable algorithm in random number generator. The exploit has been disclosed to the public…
When was CVE-2021-4240 disclosed?
CVE-2021-4240 was first published in the National Vulnerability Database on November 15, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-4240 actively exploited?
CVE-2021-4240 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-4240?
CVE-2021-4240 has a CVSS v3 base score of 2.6 (NVD).
How do I remediate CVE-2021-4240?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4240, 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.

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