CVE-2021-21933Public exploitNetwork attack vector

Database disclosure via esn_filter SQL injection

Published Dec 22, 2021 · Updated Aug 3, 2024

SQL injection in Advantech R-SeeNet 2.4.16 and earlier allows remote authenticated users to read database data via an HTTP request. device_list.php URL-decodes esn_filter and concatenates it into SQL that a stored procedure dynamically prepares and executes without parameter binding. Any authenticated account can reach the device list; cross-site request forgery can drive a logged-in browser, and the demonstrated impact is data disclosure.

CVSS severity7.7
High
EPSS probability1.14%
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 Advantech R-SeeNet 2.4.16 and earlier allows remote authenticated users to read database data via an HTTP request. device_list.php URL-decodes esn_filter and concatenates it into SQL that a stored procedure dynamically prepares and executes without parameter binding. Any authenticated account can reach the device list; cross-site request forgery can drive a logged-in browser, and the demonstrated impact is data disclosure.

The record

CVE
CVE-2021-21933
Published
Dec 22, 2021
Updated
Aug 3, 2024
Vendor
Advantech
Product
R-SeeNet
Classifications
CWE-89, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Advantech R-SeeNet Advantech R-SeeNet 2.4.15 (30.07.2021)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Advantech · R-SeeNetversion=Advantech R-SeeNet Advantech R-SeeNet 2.4.15 (30.07.2021)

Published CVSS scores

7.7Cisco TalosCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/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.

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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-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
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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