CVE-2024-7983Network attack vector

Server hang via unbounded markdown conversion

Published Mar 20, 2025 · Updated Oct 15, 2025

Denial of service in Open WebUI 0.3.8 allows remote attackers to hang the server through an unauthenticated markdown conversion request. The get_html_from_markdown route passes the submitted md value directly to markdown.markdown without bounding input complexity or processing time. A crafted payload monopolizes conversion work, leaving the server unresponsive to other requests until processing finishes.

CVSS severity7.5
High
EPSS probability0.85%
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 Open WebUI 0.3.8 allows remote attackers to hang the server through an unauthenticated markdown conversion request. The get_html_from_markdown route passes the submitted md value directly to markdown.markdown without bounding input complexity or processing time. A crafted payload monopolizes conversion work, leaving the server unresponsive to other requests until processing finishes.

The record

CVE
CVE-2024-7983
Published
Mar 20, 2025
Updated
Oct 15, 2025
Vendor
Open WebUI
Product
Open WebUI
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=unspecified <=latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open WebUI · Open WebUIversion=unspecified <=latest

Published CVSS scores

7.5huntr.devCVSS:3.0/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.

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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
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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