CVE-2021-28485

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-14 · updated 2026-06-17
Weakness: CWE-22

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.

Affected products

Ericsson Mobile Switching Center Server Bc 18A Firmware: from is_3.1 before is_3.1_cp22 — fixed in is_3.1_cp22

How to fix

Upgrade to a fixed version: Ericsson Mobile Switching Center Server Bc 18A Firmware is_3.1_cp22. Check the vendor advisory for mitigations.

References

https://www.ericsson.com/en/about-us/security/psirt
https://www.gruppotim.it/it/footer/red-team.html
https://www.ericsson.com/en/about-us/security/psirt
https://www.gruppotim.it/it/footer/red-team.html

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