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TI-2026-68028 Aliases CVE-2026-78862GHSA-qqh8-9c7w-5wf7

Arbitrary code execution via UART interface in Mercusys AC12 V2

Priority HIGH 65CWE-1299Published · Updated

Key facts

Attack vector
Physical
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

Mercusys AC12 V2 contains a flaw where the UART serial interface on the printed circuit board is not protected against misuse (CWE-1299). A local attacker with no privileges and no user interaction can execute arbitrary code through this interface, with high impact to confidentiality, integrity and availability. CISA's SSVC assessment lists exploitation as proof of concept.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

An issue in Mercusys AC12 V2 allows a local attacker to execute arbitrary code via the UART serial interface on the printed circuit board (PCB)

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00261 17th 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
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Mercusys AC12 V2.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-78862
  2. 2026-10-06 Alias added: GHSA-qqh8-9c7w-5wf7
  3. 2026-10-06 CVSS score added · CISA ADP
  4. 2026-10-06 Weakness changed · CISA ADP
  5. 2026-10-06 CISA SSVC decision points changed
  6. 2026-10-06 Priority changed: LOW → HIGH

References

Other 3

Sources

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