CVE-2024-22871Public exploitNetwork attack vector

Thread hang via infinite sequence hashing

Published Feb 29, 2024 · Updated Nov 4, 2025

Deserialization denial of service in Clojure 1.7.0 through 1.11.1 lets remote attackers hang the deserialization thread. Cycle, infinite Repeat, and Iterate inherit ASeq.hashCode(), which traverses the unbounded sequence when HashMap hashes a key during ObjectInputStream.readObject(). Programs are exposed only when they deserialize attacker-controlled Java objects; 1.12.0-alpha1 through 1.12.0-alpha8 is also affected, and the reading thread loops indefinitely.

CVSS severity7.5
High
EPSS probability1.53%
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

Deserialization denial of service in Clojure 1.7.0 through 1.11.1 lets remote attackers hang the deserialization thread. Cycle, infinite Repeat, and Iterate inherit ASeq.hashCode(), which traverses the unbounded sequence when HashMap hashes a key during ObjectInputStream.readObject(). Programs are exposed only when they deserialize attacker-controlled Java objects; 1.12.0-alpha1 through 1.12.0-alpha8 is also affected, and the reading thread loops indefinitely.

The record

CVE
CVE-2024-22871
Published
Feb 29, 2024
Updated
Nov 4, 2025
Vendor
Clojure
Product
Clojure
Classifications
CWE-502, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=1.12.0-alpha5 <=1.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Clojure · Clojureversion=1.12.0-alpha5 <=1.20

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHubCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1499.004Application or System Exploitation

Public exploit references

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