CVE-2021-33180Network attack vector

Unauthenticated SQL execution via unneutralized CGI input

Published Jun 1, 2021 · Updated Sep 17, 2024

SQL injection in the CGI component of Synology Media Server before 1.8.1-2876 allows remote attackers to execute arbitrary SQL commands. The CGI component fails to neutralize attacker-controlled special characters before placing them in an SQL command, although Synology has not disclosed the endpoint or parameter. No authentication or user interaction is required, and successful exploitation permits database operations within the CGI process's database privileges.

CVSS severity9.8
Critical
EPSS probability0.99%
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 the CGI component of Synology Media Server before 1.8.1-2876 allows remote attackers to execute arbitrary SQL commands. The CGI component fails to neutralize attacker-controlled special characters before placing them in an SQL command, although Synology has not disclosed the endpoint or parameter. No authentication or user interaction is required, and successful exploitation permits database operations within the CGI process's database privileges.

The record

CVE
CVE-2021-33180
Published
Jun 1, 2021
Updated
Sep 17, 2024
Vendor
Synology
Product
Media Server
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <1.8.1-2876

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Synology · Media Serverversion=unspecified <1.8.1-2876

Published CVSS scores

7.3Synology Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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