DDNS credential disclosure via plaintext HTTP
Published Jun 3, 2026 · Updated Jun 3, 2026
Cleartext credential transmission in the Mercusys AC12G (EU) V1 DDNS client allows man-in-the-middle attackers to read DDNS credentials. The client sends its username and password to DynDNS and No-IP over HTTP using a reversible Base64 Authorization header instead of TLS. An attacker must observe traffic between the router and provider; interception exposes the DDNS account credentials but does not alter the router or interrupt service.
Summary
What happened
Cleartext credential transmission in the Mercusys AC12G (EU) V1 DDNS client allows man-in-the-middle attackers to read DDNS credentials. The client sends its username and password to DynDNS and No-IP over HTTP using a reversible Base64 Authorization header instead of TLS. An attacker must observe traffic between the router and provider; interception exposes the DDNS account credentials but does not alter the router or interrupt service.
The record
- CVE
- CVE-2026-36610
- Published
- Jun 3, 2026
- Updated
- Jun 3, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-523, CWE-319, T1040
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 3, 2026CVE publishedPublication date reported by the CVE source.
- Jun 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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