CVE-2025-11374Network attack vectorHinoki check available

Authenticated service interruption via unbounded KV payloads

Published Oct 28, 2025 · Updated Oct 28, 2025

Resource exhaustion in HashiCorp Consul and Consul Enterprise allows remote authenticated users to interrupt service through the KV API. The KVSPut handler trusts a missing or nonpositive Content-Length, then copies the entire request body into an in-memory buffer without enforcing KVMaxValueSize. A key:write-capable user can send an oversized PUT body without the header, exhausting memory and destabilizing or stopping the agent.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource exhaustion in HashiCorp Consul and Consul Enterprise allows remote authenticated users to interrupt service through the KV API. The KVSPut handler trusts a missing or nonpositive Content-Length, then copies the entire request body into an in-memory buffer without enforcing KVMaxValueSize. A key:write-capable user can send an oversized PUT body without the header, exhausting memory and destabilizing or stopping the agent.

The record

CVE
CVE-2025-11374
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
HashiCorp
Product
Consul Enterprise
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=1.22.0 <0 changes=[{"at":"1.21.6","status":"unaffected"},{"at":"1.20.8","status":"unaffected"},{"at":"1.18.12","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HashiCorp · Consul Enterpriseversion=1.22.0 <0 changes=[{"at":"1.21.6","status":"unaffected"},{"at":"1.20.8","status":"unaffected"},{"at":"1.18.12","status":"unaffected"}]
HashiCorp · Consulversion=0 <1.22.0

Published CVSS scores

6.5HashiCorp Inc.CVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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

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Your stack

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