CVE-2025-3864Public exploitNetwork attack vector

Service interruption via redirected connection leakage

Published May 28, 2025 · Updated Jan 26, 2026

Resource exhaustion in Benoit Chesneau Hackney before 1.24.0 allows remote attackers to interrupt dependent applications via HTTP 307 responses. In hackney.erl, reply_response returns a redirect without consuming its body, so a pooled connection remains checked out instead of being released. The attacker must control an HTTP server reached through a pooled request; repeated redirects fill the pool and make later checkouts time out.

CVSS severity2.3
Low
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Benoit Chesneau Hackney before 1.24.0 allows remote attackers to interrupt dependent applications via HTTP 307 responses. In hackney.erl, reply_response returns a redirect without consuming its body, so a pooled connection remains checked out instead of being released. The attacker must control an HTTP server reached through a pooled request; repeated redirects fill the pool and make later checkouts time out.

The record

CVE
CVE-2025-3864
Published
May 28, 2025
Updated
Jan 26, 2026
Vendor
Benoit Chesneau
Product
Hackney
Classifications
CWE-772, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <1.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Benoit Chesneau · Hackneyversion=0 <1.24.0

Published CVSS scores

2.3CERT.PLCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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.

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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-772Missing Release of Resource after Effective Lifetime
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

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Your stack

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