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CVE-2024-21909

23
FAUCET Score

CVE-2024-21909 is a denial-of-service vulnerability affecting PeterO.Cbor versions 4.0.0 through 4.5.0. An unauthenticated, remote attacker can trigger this condition by providing specially crafted data to the library's decoding mechanisms. With a CVSS score of 7.5 (High), this vulnerability has a low attack complexity and can lead to a complete denial of service, with no impact on confidentiality or integrity. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, < 4.5.1CPE matchmatch criteria
cpe:2.3:a:peteroupc:cbor:*:*:*:*:*:.net:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.06%
Probability of exploitation in next 30 days
EPSS Percentile
61.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 38th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: PeterO.CborFixed in: 4.5.1

Vendor Advisories (1)

nugetGHSA-6r92-cgxc-r5fghigh

Denial of service in CBOR library

Jan 21, 2022

References

github.com / advisories/GHSA-6r92-cgxc-r5fg
Third Party Advisory
github.com / peteroupc/CBOR/commit/b4117dbbb4cd5a4a963f9d0c9aa132f033e15b95
Patch
github.com / peteroupc/CBOR/compare/v4.5...v4.5.1
Release Notes
github.com / peteroupc/CBOR/security/advisories/GHSA-6r92-cgxc-r5fg
Third Party Advisory
vulncheck.com / advisories/vc-advisory-GHSA-6r92-cgxc-r5fg
Third Party Advisory