CVE-2021-25971Network attack vector

Media-upload denial of service via malformed SVG

Published Oct 20, 2021 · Updated Apr 30, 2025

Uncaught exception handling in Camaleon CMS 2.0.1 through 2.6.0 allows remote authenticated users to disable media uploads via a malformed SVG. The file_parse method passes the uploaded SVG to MiniMagick and reads its width and height without rescuing malformed-image exceptions. Low-privileged media-upload access is sufficient, and the resulting failure persistently interrupts the media-upload feature rather than the entire site.

CVSS severity4.3
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception handling in Camaleon CMS 2.0.1 through 2.6.0 allows remote authenticated users to disable media uploads via a malformed SVG. The file_parse method passes the uploaded SVG to MiniMagick and reads its width and height without rescuing malformed-image exceptions. Low-privileged media-upload access is sufficient, and the resulting failure persistently interrupts the media-upload feature rather than the entire site.

The record

CVE
CVE-2021-25971
Published
Oct 20, 2021
Updated
Apr 30, 2025
Vendor
Camaleon CMS
Product
Camaleon CMS
Classifications
CWE-248, CWE-755, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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=2.0.1 <unspecified
  2. Affected versionversion=unspecified <=2.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Camaleon CMS · Camaleon CMSversion=2.0.1 <unspecified; version=unspecified <=2.6.0

Published CVSS scores

4.3MendCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0NISTAV:N/AC:L/Au:S/C:N/I:N/A:P

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
CWE-755Improper Handling of Exceptional Conditions
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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