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
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: Elevated riskExposed: 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)
EG Risk
54(Track*)
EG Risk 54/100SSVC: 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
Severity84% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
5%
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 4× in last 7d / 26× 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 245 total refreshes for this CVE.

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

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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 0% probability of exploitation in the next 30 days, which ranks it in the top 95.3% of all scored CVEs.
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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