CVE-2023-2538: TLS Private Key Accessible to External Parties

Severity: medium (CVSS 4.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-05 · updated 2026-06-17
Weakness: CWE-552

Description

A CWE-552 "Files or Directories Accessible to External Parties” in the web interface of the Tyan S5552 BMC version 3.00 allows an unauthenticated remote attacker to retrieve the private key of the TLS certificate in use by the BMC via forced browsing. This can then be abused to perform Man-in-the-Middle (MitM) attacks against victims that access the web interface through HTTPS.

Affected products

tyan S5552/S5552Gm2Nr Firmware: 3.0.0
tyan S5552/S5552Gm4Nr Firmware: 3.0.0
tyan S5552/S5552Wgm4Nr-Ex Firmware: 3.0.0
tyan S5552/S5552Wgm4Nr Firmware: 3.0.0

References

https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2023-2538/
https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2023-2538/

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