CVE-2024-56332Network attack vector

Denial of service via hanging Server Action requests

Published Jan 3, 2025 · Updated Jan 3, 2025

Denial of service in Server Actions in affected Vercel Next.js releases allows remote attackers to hang HTTP requests indefinitely. Server Action request handling keeps an attacker-controlled connection open while awaiting a request that never completes, leaving execution pending until the host cancels it. Only deployments using Server Actions are affected; absent a long-running invocation timeout, connections remain occupied and time-based hosting charges can accumulate.

CVSS severity5.3
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Server Actions in affected Vercel Next.js releases allows remote attackers to hang HTTP requests indefinitely. Server Action request handling keeps an attacker-controlled connection open while awaiting a request that never completes, leaving execution pending until the host cancels it. Only deployments using Server Actions are affected; absent a long-running invocation timeout, connections remain occupied and time-based hosting charges can accumulate.

The record

CVE
CVE-2024-56332
Published
Jan 3, 2025
Updated
Jan 3, 2025
Vendor
Vercel
Product
Next.js
Classifications
CWE-770, CAPEC-469, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 3, 2025Record 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=>= 13.0.0, < 13.5.8
  2. Affected versionversion=>= 14.0.0, < 14.2.21
  3. Affected versionversion=>= 15.0.0, < 15.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · Next.jsversion=>= 13.0.0, < 13.5.8; version=>= 14.0.0, < 14.2.21; version=>= 15.0.0, < 15.1.2

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-770Allocation of Resources Without Limits or Throttling
CAPEC-469HTTP DoS
T1499.004Endpoint Denial of Service: Application 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

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Your stack

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