CVE-2021-4097

Name: CVE-2021-4097
Creator: NVD / NIST
Published: 2021-12-12T00:15:07.743+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.84%

Last modified Jun 17, 2026

CVE-2021-4097 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. phpservermon is vulnerable to Improper Neutralization of CRLF Sequences. EPSS estimates a 0.84% chance of exploitation in the next 30 days.

Description

phpservermon is vulnerable to Improper Neutralization of CRLF Sequences

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.84%

53.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-93

Affected Software

Vendor	Product	Versions
Phpservermonitor	Php Server Monitor	< 3.6.0

References

https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4Patch, Third Party Advisory
https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43Exploit, Patch, Third Party Advisory
https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4Patch, Third Party Advisory
https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43Exploit, Patch, Third Party Advisory

Timeline

Published: Dec 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4097?

phpservermon is vulnerable to Improper Neutralization of CRLF Sequences

How severe is CVE-2021-4097?

CVE-2021-4097 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.84% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4097?

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-2021-4097?

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

Scan your code now

Source: NVD / NIST