What is CVE-2021-28485?

CVE-2021-28485 is a medium-severity vulnerability in Ericsson Mobile Switching Center Server Bc 18a, classified under Path Traversal. CVSS score: 4.3/10. Published 2023-09-14.

How severe is CVE-2021-28485?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Path Traversal in Ericsson Mobile Switching Center Server Bc 18a

CVE-2021-28485

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.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2023-09-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-22 — Path Traversal

References

www.gruppotim.it/it/footer/red-team.html (Third Party Advisory)
www.ericsson.com/en/about-us/security/psirt (Vendor Advisory)

Frequently asked questions

What is CVE-2021-28485?: CVE-2021-28485 is a medium-severity vulnerability in Ericsson Mobile Switching Center Server Bc 18a, classified under Path Traversal. CVSS score: 4.3/10. Published 2023-09-14.
How severe is CVE-2021-28485?: Medium severity. CVSS v3 base score is 4.3 out of 10.