CVE-2021-28485

Name: CVE-2021-28485
Creator: NVD / NIST
Published: 2023-09-14T15:15:07.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2021-28485 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. In Ericsson Mobile Switching Center Server (MSC-S) before IS 3.1 CP22, the SIS web application allows relative path traversal via a specific parameter in the https request after authentication, which allows access to files on the system that are not intended to be accessible via the web application.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

In Ericsson Mobile Switching Center Server (MSC-S) before IS 3.1 CP22, the SIS web application allows relative path traversal via a specific parameter in the https request after authentication, which allows access to files on the system that are not intended to be accessible via the web application.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.55%

41.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Ericsson	Mobile Switching Center Server Bc 18a Firmware	>= is_3.1, < is_3.1_cp22

References

https://www.ericsson.com/en/about-us/security/psirtVendor Advisory
https://www.gruppotim.it/it/footer/red-team.htmlThird Party Advisory
https://www.ericsson.com/en/about-us/security/psirtVendor Advisory
https://www.gruppotim.it/it/footer/red-team.htmlThird Party Advisory

Timeline

Published: Sep 14, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28485?

How severe is CVE-2021-28485?

CVE-2021-28485 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28485?

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-2021-28485?

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

Scan your code now

Source: NVD / NIST