CVE-2021-24295

Name: CVE-2021-24295
Creator: NVD / NIST
Published: 2021-05-17T17:15:08.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.69%

Last modified Jun 17, 2026

CVE-2021-24295 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. It was possible to exploit an Unauthenticated Time-Based Blind SQL Injection vulnerability in the Spam protection, AntiSpam, FireWall by CleanTalk WordPress Plugin before 5.153.4. The update_log function in lib/Cleantalk/ApbctWP/Firewall/SFW.php included a vulnerable query that could be injected via the User-Agent Header by manipulating the cookies set by the Spam protection, AntiSpam, FireWall by CleanTalk WordPress plugin before 5.153.4, sending an initial request to obtain a ct_sfw_pass_key cookie and then manually setting a separate ct_sfw_passed cookie and disallowing it from being reset.. EPSS estimates a 4.69% chance of exploitation in the next 30 days.

Description

It was possible to exploit an Unauthenticated Time-Based Blind SQL Injection vulnerability in the Spam protection, AntiSpam, FireWall by CleanTalk WordPress Plugin before 5.153.4. The update_log function in lib/Cleantalk/ApbctWP/Firewall/SFW.php included a vulnerable query that could be injected via the User-Agent Header by manipulating the cookies set by the Spam protection, AntiSpam, FireWall by CleanTalk WordPress plugin before 5.153.4, sending an initial request to obtain a ct_sfw_pass_key cookie and then manually setting a separate ct_sfw_passed cookie and disallowing it from being reset.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

4.69%

90.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-89

Affected Software

Vendor	Product	Versions
Cleantalk	Spam Protection\, Antispam\, Firewall	< 5.153.4

References

https://wpscan.com/vulnerability/152171fc-888c-4275-a118-5a1e664ef28bThird Party Advisory
https://www.wordfence.com/blog/2021/05/sql-injection-vulnerability-patched-in-cleantalk-antispam-plugin/Exploit, Third Party Advisory
https://wpscan.com/vulnerability/152171fc-888c-4275-a118-5a1e664ef28bThird Party Advisory
https://www.wordfence.com/blog/2021/05/sql-injection-vulnerability-patched-in-cleantalk-antispam-plugin/Exploit, Third Party Advisory

Timeline

Published: May 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24295?

How severe is CVE-2021-24295?

CVE-2021-24295 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24295?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24295?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST