CVE-2021-26637
CWE-287Published: June 23, 2022· Updated: Jun 17, 2026
Official Description
There is no account authentication and permission check logic in the firmware and existing apps of SiHAS's SGW-300, ACM-300, GCM-300, so unauthorized users can remotely control the device.
Risk Analysis
SiHAS smart home devices, including the SGW-300, ACM-300, and GCM-300, lack necessary authentication and permission checks. This allows remote, unauthenticated users to take full control of the affected hardware.
No public exploit is known, and it is not in the KEV catalog. It is remotely exploitable with low complexity.
Apply vendor-provided firmware updates. Restrict network access to these devices to prevent unauthorized remote interaction.
Technical Analysis
CVE-2021-26637 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (2)
Quick Facts
Related CVEs (CWE-287)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-26637 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts