CVE-2023-40586Public exploitNetwork attack vector

Service crash via fatal multipart parse error

Published Aug 25, 2023 · Updated Oct 2, 2024

Denial of service in Coraza before 3.0.1 allows remote attackers to crash its hosting application via a crafted multipart request. The multipart body processor passes a duplicate-parameter Content-Type to mime.ParseMediaType, then handles the returned error with log.Fatalf, which calls os.Exit. No authentication or user interaction is required; one malformed request terminates the WAF-enabled process rather than only rejecting the request.

CVSS severity7.5
High
EPSS probability0.72%
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 Coraza before 3.0.1 allows remote attackers to crash its hosting application via a crafted multipart request. The multipart body processor passes a duplicate-parameter Content-Type to mime.ParseMediaType, then handles the returned error with log.Fatalf, which calls os.Exit. No authentication or user interaction is required; one malformed request terminates the WAF-enabled process rather than only rejecting the request.

The record

CVE
CVE-2023-40586
Published
Aug 25, 2023
Updated
Oct 2, 2024
Vendor
Coraza WAF
Product
Coraza
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 2024Record 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=< 3.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Coraza WAF · Corazaversion=< 3.0.1

Published CVSS scores

7.5GitHub CNACVSS: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 exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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