CVE-2021-31538

Name: CVE-2021-31538
Creator: NVD / NIST
Published: 2021-06-10T15:15:09.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.49%

Last modified Jun 17, 2026

CVE-2021-31538 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. LANCOM R&S Unified Firewall (UF) devices running LCOS FX 10.5 allow Relative Path Traversal.. EPSS estimates a 1.49% chance of exploitation in the next 30 days.

Description

LANCOM R&S Unified Firewall (UF) devices running LCOS FX 10.5 allow Relative Path Traversal.

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

1.49%

70.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Lancom-Systems	Lcos Fx	10.5

References

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-010.txtExploit, Third Party Advisory
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-010.txtExploit, Third Party Advisory

Timeline

Published: Jun 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31538?

LANCOM R&S Unified Firewall (UF) devices running LCOS FX 10.5 allow Relative Path Traversal.

How severe is CVE-2021-31538?

CVE-2021-31538 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31538?

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-2021-31538?

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

Scan your code now

Source: NVD / NIST