CVE-2023-28770 — The sensitive information exposure vulnerability in the CGI “Export_Log” and the

The sensitive information exposure vulnerability in the CGI “Export_Log” and the binary “zcmd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to read the system files and to retrieve the password of the supervisor from

01What is this vulnerability?

The sensitive information exposure vulnerability in the CGI “Export_Log” and the binary “zcmd” in Zyxel DX5401-B0 firmware versions prior to V5.17(ABYO.1)C0 could allow a remote unauthenticated attacker to read the system files and to retrieve the password of the supervisor from the encrypted file.

02Affected products

Vendor	Product	Versions
Zyxel	DX5401	B0 firmware — < V5.17(ABYO.1)C0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-04-27T00:00:00.000Z
• Last modified: 2025-01-31T18:42:32.309Z

09References

• www.zyxel.com — https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advis…
• packetstormsecurity.com — http://packetstormsecurity.com/files/172277/Zyxel-Chained-Remote-Code-Execution.…