What’s Vulnerable › Vulnerabilities

CVE-2021-26637: SiHAS Improper Authentication vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-23 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Shinasys Sihas Acm-300 Firmware: all versions
• Shinasys Sihas Gcm-300 Firmware: all versions
• Shinasys Sihas Sgw-300 Firmware: all versions

References

• https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66782
• https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66782

Get alerted when CVE-2021-26637 or the next vulnerability affects your stack