CVE-2020-5187Public exploitNetwork attack vector

Authenticated file overwrite via unsafe ZIP extraction

Published Feb 24, 2020 · Updated Aug 4, 2024

Path traversal in DNN Platform 9.4.4 and earlier allows remote authenticated users to overwrite permitted file types via crafted ZIP files. The file-upload ZIP extraction function fails to validate archive entry directory names before writing them beneath the extraction target. A low-privileged account can pair the flaw with the upload-extension bypass to replace allowed files, including CSS content used for site defacement.

CVSS severity8.8
High
EPSS probability2.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in DNN Platform 9.4.4 and earlier allows remote authenticated users to overwrite permitted file types via crafted ZIP files. The file-upload ZIP extraction function fails to validate archive entry directory names before writing them beneath the extraction target. A low-privileged account can pair the flaw with the upload-extension bypass to replace allowed files, including CSS content used for site defacement.

The record

CVE
CVE-2020-5187
Published
Feb 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1491.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 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 exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1491.002External Defacement

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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