CVE-2020-37221

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-05-13. NVD baseline CVSS 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.4Exploit: NoneExposed: 0

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

Atomic Alarm Clock 6.3 contains a stack overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string to the display name textbox in the Time Zones Clock configuration. Attackers can craft a buffer with structured exception handling overwrite and encoded shellcode to bypass SafeSEH protections and execute arbitrary commands with application privileges.

CVSS v3
8.4
EG Score
8.4(medium)
EPSS
4.8%
KEV
Not listed

Published

May 13, 2026

Last Modified

May 13, 2026

Advisory Details (2)

Auto-updated May 13, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Atomic Alarm Clock 6.3 Stack Overflow via SEH Unicode | Advisories | VulnCheck

https://www.vulncheck.com/advisories/atomic-alarm-clock-stack-overflow-via-seh-unicode
generic🟡 PoC Available

Atomic Alarm Clock 6.3 - Stack Overflow (Unicode+SEH) - Windows local Exploit

https://www.exploit-db.com/exploits/48346

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 55× 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 189 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2020-37221?
CVE-2020-37221 is a high vulnerability published on May 13, 2026. Atomic Alarm Clock 6.3 contains a stack overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string to the display name textbox in the Time Zones Clock configuration. Attackers can craft a buffer with structured exception handling overwrite and…
When was CVE-2020-37221 disclosed?
CVE-2020-37221 was first published in the National Vulnerability Database on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-37221 actively exploited?
CVE-2020-37221 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-37221?
CVE-2020-37221 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2020-37221?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-37221, 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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