An issue in Mercusys AC12 V2 allows a local attacker to execute arbitrary code via a hardcoded 512-bit RSA Private Key (CVE-2026-78861)
Description
Mercusys AC12 V2 contains a vulnerability where a hardcoded 512-bit RSA private key allows a local attacker to execute arbitrary code. This issue is identified as CVE-2026-78861 and has a high severity rating with a CVSS score of 7.7. The vulnerability requires local access and does not require user interaction. No patch or remediation information is currently provided.
CVSS v3.1
Score 7.7high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-78861 describes a vulnerability in Mercusys AC12 V2 where a hardcoded 512-bit RSA private key is embedded in the device. This key can be exploited by a local attacker to execute arbitrary code on the device. The CVSS 3.1 vector indicates low attack complexity and no privileges required, but local access is necessary. The vulnerability impacts confidentiality and integrity but not availability.
Potential Impact
An attacker with local access to the Mercusys AC12 V2 device can leverage the hardcoded RSA private key to execute arbitrary code, potentially compromising the device's confidentiality and integrity. This could lead to unauthorized control or data exposure on the affected device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is available at this time. Until a patch is released, restrict local access to the device to trusted users only.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4jgr-x73g-p576
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-78861"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac56b272cdf04f656e1c5b2
Added to database: 10/06/2026, 21:41:59 UTC
Last enriched: 10/06/2026, 21:44:24 UTC
Last updated: 10/06/2026, 22:48:07 UTC
Views: 4
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