CVE-2025-48879

Web server hang via missing multipart boundary

Published Jun 10, 2025 · Updated Jun 10, 2025

Denial of service in OctoPrint 1.11.1 and earlier allows remote attackers to hang the web server via a malformed multipart request. UploadStorageFallbackHandler repeatedly processes a buffer that cannot shrink when the closing boundary is absent, leaving Tornado's single thread in an endless busy loop. No authentication or user interaction is required, but the attacker must reach the service from an adjacent network; the result is a web-service hang.

CVSS severity6.5
Medium
EPSS probability0.26%
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 OctoPrint 1.11.1 and earlier allows remote attackers to hang the web server via a malformed multipart request. UploadStorageFallbackHandler repeatedly processes a buffer that cannot shrink when the closing boundary is absent, leaving Tornado's single thread in an endless busy loop. No authentication or user interaction is required, but the attacker must reach the service from an adjacent network; the result is a web-service hang.

The record

CVE
CVE-2025-48879
Published
Jun 10, 2025
Updated
Jun 10, 2025
Vendor
OctoPrint
Product
OctoPrint
Classifications
CWE-140, CWE-835, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 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=< 1.11.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

OctoPrint · OctoPrintversion=< 1.11.2

Published CVSS scores

6.5GitHubCVSS:3.1/AV:A/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-140Improper Neutralization of Delimiters
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
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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