TLS Private Key Accessible to External Parties
Priority LOW 26CWE-552Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-552.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00243 15th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| tyan | s5552_bmc | 3.00 | — | No fix listed | CNA |
- s5552_bmc Vendortyan Affected 3.00 Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:tyan:s5552\/s5552wgm4nr-ex_firmware:3.0.0:*:*:*:*:*:*:* | 3.0.0 | Vulnerable | tyan |
| cpe:2.3:h:tyan:s5552\/s5552wgm4nr-ex:-:*:*:*:*:*:*:* | not specified by NVD | Running on | tyan |
| cpe:2.3:o:tyan:s5552\/s5552wgm4nr_firmware:3.0.0:*:*:*:*:*:*:* | 3.0.0 | Vulnerable | tyan |
| cpe:2.3:h:tyan:s5552\/s5552wgm4nr:-:*:*:*:*:*:*:* | not specified by NVD | Running on | tyan |
| cpe:2.3:o:tyan:s5552\/s5552gm4nr_firmware:3.0.0:*:*:*:*:*:*:* | 3.0.0 | Vulnerable | tyan |
| cpe:2.3:h:tyan:s5552\/s5552gm4nr:-:*:*:*:*:*:*:* | not specified by NVD | Running on | tyan |
| cpe:2.3:o:tyan:s5552\/s5552gm2nr_firmware:3.0.0:*:*:*:*:*:*:* | 3.0.0 | Vulnerable | tyan |
| cpe:2.3:h:tyan:s5552\/s5552gm2nr:-:*:*:*:*:*:*:* | not specified by NVD | Running on | tyan |
- cpe:2.3:o:tyan:s5552\/s5552wgm4nr-ex_firmware:3.0.0:*:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·tyan
- cpe:2.3:h:tyan:s5552\/s5552wgm4nr-ex:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·tyan
- cpe:2.3:o:tyan:s5552\/s5552wgm4nr_firmware:3.0.0:*:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·tyan
- cpe:2.3:h:tyan:s5552\/s5552wgm4nr:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·tyan
- cpe:2.3:o:tyan:s5552\/s5552gm4nr_firmware:3.0.0:*:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·tyan
- cpe:2.3:h:tyan:s5552\/s5552gm4nr:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·tyan
- cpe:2.3:o:tyan:s5552\/s5552gm2nr_firmware:3.0.0:*:*:*:*:*:*:* Versions 3.0.0 Vulnerable ·tyan
- cpe:2.3:h:tyan:s5552\/s5552gm2nr:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·tyan
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-2538
- 2026-10-03 Alias added: GHSA-4m78-wr94-p294
References
Sources
- CVE-2023-2538 · CVE Program
- CVE-2023-2538 · NVD
- FIRST EPSS
- GHSA-4m78-wr94-p294 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences