CVE-2021-21930Public exploitNetwork attack vector

Database disclosure via sn_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 sn_filter. device_list.php URL-decodes sn_filter into a session variable, escapes it, and concatenates it into SQL passed to stored procedures that prepare @sql without parameter bindings. Any authenticated account can reach the page, while cross-site request forgery can supply a victim session; the demonstrated impact is database 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 sn_filter. device_list.php URL-decodes sn_filter into a session variable, escapes it, and concatenates it into SQL passed to stored procedures that prepare @sql without parameter bindings. Any authenticated account can reach the page, while cross-site request forgery can supply a victim session; the demonstrated impact is database disclosure.

The record

CVE
CVE-2021-21930
Published
Dec 22, 2021
Updated
Aug 3, 2024
Vendor
Advantech
Product
R-SeeNet
Classifications
CWE-89, T1213
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

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
7.7Cisco TalosCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1213Data from Information Repositories

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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