CVE-2021-25070Network attack vector

Unauthenticated SQL injection via unescaped User-Agent

Published Mar 28, 2022 · Updated Aug 3, 2024

SQL injection in the Block Bad Bots WordPress plugin before 6.88 allows remote attackers to alter database queries with a crafted User-Agent. The log-recording path inserts the HTTP User-Agent into an SQL statement without sanitization or escaping, so attacker-controlled SQL changes the query. No authentication or user interaction is required; successful injection can read or modify database data or interrupt database-backed service.

CVSS severity9.8
Critical
EPSS probability1.61%
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 Block Bad Bots WordPress plugin before 6.88 allows remote attackers to alter database queries with a crafted User-Agent. The log-recording path inserts the HTTP User-Agent into an SQL statement without sanitization or escaping, so attacker-controlled SQL changes the query. No authentication or user interaction is required; successful injection can read or modify database data or interrupt database-backed service.

The record

CVE
CVE-2021-25070
Published
Mar 28, 2022
Updated
Aug 3, 2024
Vendor
sminozzi
Product
Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protection
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 28, 2022CVE 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=6.88 <6.88

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

sminozzi · Block Bad Bots and Stop Bad Bots Crawlers and Spiders and Anti Spam Protectionversion=6.88 <6.88

Published CVSS scores

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

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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