CVE-2021-26777

9.8 criticalEPSS 2.5%

Critical (9.8) in circutor compact dc-s basic firmware. EPSS 2.5% chance of exploitation in the next 30 days.

Buffer overflow vulnerability in function SetFirewall in index.cgi in CIRCUTOR COMPACT DC-S BASIC smart metering concentrator Firwmare version CIR_CDC_v1.2.17, allows attackers to execute arbitrary code.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 2.5% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)
CWE: CWE-120
Published: 2021-12-02
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

circutor:compact_dc-s_basic_firmware

References

https://github.com/Ell0/plc_concentrator_vulns/
https://github.com/Ell0/plc_concentrator_vulns/

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