Adjacent memory disclosure via undefined-path POST handling
Published Jun 3, 2026 · Updated Jun 3, 2026
Information disclosure in Mercusys AC12G (EU) V1 firmware AC12G(EU)_V1_200909 allows remote attackers to read memory via crafted POST requests. The VxWorks POST handler sends its 128-byte header-parsing buffer for undefined paths and reads 67 bytes beyond an included body into adjacent heap memory. No authentication is required, but the attacker must be on the device's LAN; responses expose headers, prior response fragments, and stable memory addresses.
Summary
What happened
Information disclosure in Mercusys AC12G (EU) V1 firmware AC12G(EU)_V1_200909 allows remote attackers to read memory via crafted POST requests. The VxWorks POST handler sends its 128-byte header-parsing buffer for undefined paths and reads 67 bytes beyond an included body into adjacent heap memory. No authentication is required, but the attacker must be on the device's LAN; responses expose headers, prior response fragments, and stable memory addresses.
The record
- CVE
- CVE-2026-36613
- Published
- Jun 3, 2026
- Updated
- Jun 3, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125
- Attack vector
- adjacent
- 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
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo