CVE-2021-40279Public exploitNetwork attack vector

Authenticated SQL injection via unsanitized POST id

Published Dec 9, 2021 · Updated Aug 4, 2024

SQL injection in zzcms 8.2, 8.3, 2020, and 2021 allows remote authenticated users to read, modify, or delete database data via admin/bad.php. admin/bad.php concatenates unsanitized POST id array values into DELETE and UPDATE statements before passing the resulting SQL to query(). Administrative access is required; the published proof of concept uses time-delayed queries and demonstrates extraction of an administrator password hash.

CVSS severity7.2
High
EPSS probability1.10%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in zzcms 8.2, 8.3, 2020, and 2021 allows remote authenticated users to read, modify, or delete database data via admin/bad.php. admin/bad.php concatenates unsanitized POST id array values into DELETE and UPDATE statements before passing the resulting SQL to query(). Administrative access is required; the published proof of concept uses time-delayed queries and demonstrates extraction of an administrator password hash.

The record

CVE
CVE-2021-40279
Published
Dec 9, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89, T1213.006
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1213.006Data from Information Repositories: Databases

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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