CVE-2020-37121

CRITICALNVD 5.59.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory published 2026-02-05. NVD baseline CVSS 5.5; sources differ by 4.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: Elevated riskExposed: 0

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

CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.

CVSS v3
5.5
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

February 5, 2026

Last Modified

August 6, 2026

Advisory Details (4)

Auto-updated Jul 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE | Advisories | VulnCheck

https://www.vulncheck.com/advisories/codeblocks-buffer-overflow-seh-unicode
generic

Code::Blocks download | SourceForge.net

https://sourceforge.net/projects/codeblocks/
generic

Code::Blocks - Code::Blocks

https://www.codeblocks.org/
generic🟡 PoC Available

Code Blocks 16.01 - Buffer Overflow (SEH) UNICODE - Windows local Exploit

https://www.exploit-db.com/exploits/48344

Vendor Advisories for CVE-2020-37121(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 6× in last 7d / 21× 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 208 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2020-37121?
CVE-2020-37121 is a critical vulnerability published on February 5, 2026. CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code…
When was CVE-2020-37121 disclosed?
CVE-2020-37121 was first published in the National Vulnerability Database on February 5, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-37121 actively exploited?
CVE-2020-37121 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 88.9% of all scored CVEs.
What is the CVSS score of CVE-2020-37121?
CVE-2020-37121 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2020-37121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-37121, 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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