CVE-2020-18440

Name: CVE-2020-18440
Creator: NVD / NIST
Published: 2021-11-02T18:15:07.913+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.61%

Last modified Jun 17, 2026

CVE-2020-18440 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Buffer overflow vulnerability in framework/init.php in qinggan phpok 5.1, allows attackers to execute arbitrary code.. EPSS estimates a 1.61% chance of exploitation in the next 30 days.

Description

Buffer overflow vulnerability in framework/init.php in qinggan phpok 5.1, allows attackers to execute arbitrary code.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.61%

72.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Phpok	Phpok	5.1

References

https://github.com/qinggan/phpok/issues/4Exploit, Issue Tracking, Third Party Advisory
https://github.com/qinggan/phpok/issues/4Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Nov 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-18440?

Buffer overflow vulnerability in framework/init.php in qinggan phpok 5.1, allows attackers to execute arbitrary code.

How severe is CVE-2020-18440?

CVE-2020-18440 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.61% probability of exploitation in the next 30 days.

How do I fix CVE-2020-18440?

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-2020-18440?

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

Scan your code now

Source: NVD / NIST