CVE-2021-37439

Name: CVE-2021-37439
Creator: NVD / NIST
Published: 2021-07-25T22:15:07.893+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.21%

Last modified Jun 17, 2026

CVE-2021-37439 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. NCH FlexiServer v6.00 suffers from a syslog?file=/.. path traversal vulnerability.. EPSS estimates a 1.21% chance of exploitation in the next 30 days.

Description

NCH FlexiServer v6.00 suffers from a syslog?file=/.. path traversal vulnerability.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.21%

64.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Nch	Flexiserver	<= 6.00

References

https://github.com/0xfml/poc/blob/main/NCH/Flexiserver_6.00_LFI.mdExploit, Third Party Advisory
https://www.nchsoftware.com/flexi/index.htmlProduct
https://github.com/0xfml/poc/blob/main/NCH/Flexiserver_6.00_LFI.mdExploit, Third Party Advisory
https://www.nchsoftware.com/flexi/index.htmlProduct

Timeline

Published: Jul 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37439?

NCH FlexiServer v6.00 suffers from a syslog?file=/.. path traversal vulnerability.

How severe is CVE-2021-37439?

CVE-2021-37439 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37439?

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-2021-37439?

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

Scan your code now

Source: NVD / NIST