CVE-2021-37316Public exploitNetwork attack vector

Arbitrary file read via pre-decode SQL filtering

Published Feb 3, 2023 · Updated Mar 26, 2025

SQL injection in Cloud Disk in ASUS RT-AC68U firmware before 3.0.0.4.386.41634 allows remote attackers to read arbitrary files. In mod_webdav.c, quote filtering precedes URL decoding, so an encoded quote bypasses validation and stacked SQL statements set an arbitrary album-art path that GETMUSICCLASSIFICATION reads and returns. Cloud Disk and Digital Media Server must be enabled; successful exploitation can disclose password hashes from /etc/shadow without authentication.

CVSS severity7.5
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in Cloud Disk in ASUS RT-AC68U firmware before 3.0.0.4.386.41634 allows remote attackers to read arbitrary files. In mod_webdav.c, quote filtering precedes URL decoding, so an encoded quote bypasses validation and stacked SQL statements set an arbitrary album-art path that GETMUSICCLASSIFICATION reads and returns. Cloud Disk and Digital Media Server must be enabled; successful exploitation can disclose password hashes from /etc/shadow without authentication.

The record

CVE
CVE-2021-37316
Published
Feb 3, 2023
Updated
Mar 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1003.008, 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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1003.008OS Credential Dumping: /etc/passwd and /etc/shadow
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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