CVE-2016-11020Network attack vector

Remote code execution via unrestricted avatar uploads

Published Feb 24, 2020 · Updated Aug 6, 2024

Unrestricted file upload in Kunena 4.0.0 through 5.0.3 allows remote attackers to execute code or inject script via an avatar file. The avatar upload check accepts filename extensions outside the intended GIF, JPEG, JPG, and PNG allowlist, allowing dangerous files to be stored. Exploitation requires access to the avatar upload path; script or code execution depends on how the browser and server handle the uploaded file.

CVSS severity9.8
Critical
EPSS probability2.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Kunena 4.0.0 through 5.0.3 allows remote attackers to execute code or inject script via an avatar file. The avatar upload check accepts filename extensions outside the intended GIF, JPEG, JPG, and PNG allowlist, allowing dangerous files to be stored. Exploitation requires access to the avatar upload path; script or code execution depends on how the browser and server handle the uploaded file.

The record

CVE
CVE-2016-11020
Published
Feb 24, 2020
Updated
Aug 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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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