CVE-2024-23684Network attack vector

Service interruption via CBOR map key sorting

Published Jan 19, 2024 · Updated Jul 14, 2026

Algorithmic complexity in PeterO.Cbor 4.0.0 through 4.5.0 allows attackers to interrupt services with crafted CBOR maps. DecodeFromBytes reaches CBORObject.MapCompare, which sorts both maps' key lists while comparing attacker-controlled map structures. Exploitation requires an application to decode a map-containing CBOR input; network exposure depends on how that application accepts data.

CVSS severity7.5
High
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Algorithmic complexity in PeterO.Cbor 4.0.0 through 4.5.0 allows attackers to interrupt services with crafted CBOR maps. DecodeFromBytes reaches CBORObject.MapCompare, which sorts both maps' key lists while comparing attacker-controlled map structures. Exploitation requires an application to decode a map-containing CBOR input; network exposure depends on how that application accepts data.

The record

CVE
CVE-2024-23684
Published
Jan 19, 2024
Updated
Jul 14, 2026
Vendor
peteroupc
Product
PeterO.Cbor
Classifications
CWE-407, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0 <4.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

peteroupc · PeterO.Cborversion=4.0.0 <4.5.1

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo