CVE-2024-21909

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 35% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

PeterO.Cbor versions 4.0.0 through 4.5.0 are vulnerable to a denial of service vulnerability. An attacker may trigger the denial of service condition by providing crafted data to the DecodeFromBytes or other decoding mechanisms in PeterO.Cbor. Depending on the usage of the library, an unauthenticated and remote attacker may be able to cause the denial of service condition.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
61.0%
KEV
Not listed

Published

January 3, 2024

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 16, 2026
Patch available. Sources: github, github_commit.
generic

PeterO.Cbor Library Service Denial | Advisories | VulnCheck

https://vulncheck.com/advisories/vc-advisory-GHSA-6r92-cgxc-r5fg
github Patch Available

Denial of service in CBOR library · Advisory · peteroupc/CBOR · GitHub

Affected: version 4.5.1. Users should use the latest version of this library. (The latest

https://github.com/peteroupc/CBOR/security/advisories/GHSA-6r92-cgxc-r5fg
generic

Comparing v4.5...v4.5.1 · peteroupc/CBOR · GitHub

https://github.com/peteroupc/CBOR/compare/v4.5...v4.5.1
github_commit

commit b4117dbbb4cd (peteroupc/CBOR)

Fix landed in peteroupc/CBOR commit b4117dbbb4cd — awaiting tagged release

https://github.com/peteroupc/CBOR/commit/b4117dbbb4cd5a4a963f9d0c9aa132f033e15b95
github Patch Available

Denial of service in CBOR library · CVE-2024-21909 · GitHub Advisory Database · GitHub

Affected: version 4.5.1. Users should use the latest version of this library. (The latest

https://github.com/advisories/GHSA-6r92-cgxc-r5fg

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
PeterO.Cbor4.0.0 ... 4.5.0 (13 versions)4.5.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 47× 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 103 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
  2. 2026-07-21 15:23 UTCEPSS rescore
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  15. 2026-07-14 23:55 UTCOSV refresh
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  1. 2026-07-06 16:26 UTCEPSS rescore
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  6. 2026-07-01 15:05 UTCEPSS rescore
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  9. 2026-06-29 14:05 UTCEPSS rescore
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  14. 2026-06-27 03:07 UTCEPSS rescore
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  16. 2026-06-27 00:39 UTCOSV refresh
  17. 2026-06-25 13:48 UTCEPSS rescore
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  19. 2026-06-24 14:04 UTCEPSS rescore
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  25. 2026-06-21 14:55 UTCEPSS rescore
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  27. 2026-06-21 01:58 UTCEPSS rescore
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  29. 2026-06-19 19:24 UTCEPSS rescore
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  31. 2026-06-18 17:51 UTCEPSS rescore
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  38. 2026-06-14 23:16 UTCEPSS rescore
  39. 2026-06-13 22:59 UTCEPSS rescore
  40. 2026-06-13 22:59 UTCEPSS rescore
  41. 2026-06-12 23:11 UTCEPSS rescore
  42. 2026-06-11 13:59 UTCEPSS rescore
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  44. 2026-06-10 22:17 UTCEPSS rescore
  45. 2026-06-10 13:21 UTCEPSS rescore
  46. 2026-06-10 13:21 UTCEPSS rescore
  47. 2026-06-09 10:56 UTCOSV refresh
  48. 2026-06-08 14:16 UTCEPSS rescore
  49. 2026-06-08 14:16 UTCEPSS rescore
  50. 2026-06-07 15:24 UTCEPSS rescore
  51. 2026-06-07 15:24 UTCEPSS rescore
  52. 2026-06-06 13:46 UTCEPSS rescore
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  56. 2026-06-05 06:09 UTCEPSS rescore
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  58. 2026-06-04 13:11 UTCEPSS rescore
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  67. 2026-05-29 13:43 UTCEPSS rescore
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  72. 2026-05-27 13:40 UTCEPSS rescore
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  74. 2026-05-26 13:43 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2024-21909?
CVE-2024-21909 is a high vulnerability published on January 3, 2024. PeterO.Cbor versions 4.0.0 through 4.5.0 are vulnerable to a denial of service vulnerability. An attacker may trigger the denial of service condition by providing crafted data to the DecodeFromBytes or other decoding mechanisms in PeterO.Cbor. Depending on the usage of the library, an…
When was CVE-2024-21909 disclosed?
CVE-2024-21909 was first published in the National Vulnerability Database on January 3, 2024, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-21909 actively exploited?
CVE-2024-21909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-21909?
CVE-2024-21909 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2024-21909?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21909, 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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