CVE-2021-37317Public exploitNetwork attack vector

Arbitrary file write via unchecked WebDAV destinations

Published Feb 3, 2023 · Updated Mar 26, 2025

Path traversal in Cloud Disk in ASUS RT-AC68U firmware before 3.0.0.4.386.41634 allows remote attackers to write arbitrary files. The mod_webdav.so COPY and MOVE handlers fail to verify that the resolved destination remains beneath /mnt, permitting writes outside the storage tree. Cloud Disk must be enabled, and the demonstrated unauthenticated chain can overwrite router configuration or executable files, causing persistent service loss or code execution.

CVSS severity9.1
Critical
EPSS probability1.54%
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 Cloud Disk in ASUS RT-AC68U firmware before 3.0.0.4.386.41634 allows remote attackers to write arbitrary files. The mod_webdav.so COPY and MOVE handlers fail to verify that the resolved destination remains beneath /mnt, permitting writes outside the storage tree. Cloud Disk must be enabled, and the demonstrated unauthenticated chain can overwrite router configuration or executable files, causing persistent service loss or code execution.

The record

CVE
CVE-2021-37317
Published
Feb 3, 2023
Updated
Mar 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 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?

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

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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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