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No exploitation reportedFix available

CVE-2024-21909

No exploitation reported by the sources we read.

  • Published2024-01-03
  • Fixed in4.5.1
  • WeaknessCWE-407

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2024-01-0316:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2024-21909?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2024-21909?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Peteroupc cbor
BranchAffectedFixed in
4.x≥ 4.0.0, < 4.5.14.5.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Peteroupc cbor to 4.5.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2025-05-09
  • OpenCVESSVC decisionnone—
  • CISA-ADPCVSS 3.17.52025-05-09
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-407read 2026-10-23
  • NVDweakness (CWE)CWE-407read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2024-01-03
Last Modified
2026-07-14
NVD status
Modified

Frequently asked questions

What is CVE-2024-21909?

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.

Is CVE-2024-21909 actively exploited?

Active exploitation of CVE-2024-21909 has not been confirmed. Its EPSS score was 1.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2024-21909?

CVE-2024-21909 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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