What is CVE-2021-26777?

CVE-2021-26777 is a critical-severity vulnerability in Circutor Compact Dc-S Basic, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-12-02.

How severe is CVE-2021-26777?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-26777 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Circutor Compact Dc-S Basic

CVE-2021-26777

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.

Vulnerability class: Buffer Overflow

EPSS: 0.024 (82.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Circutor Compact_dc-s_basic
Circutor Compact_dc-s_basic_firmware — versions 1.2.17
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

Ell0/plc_

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-26777?: CVE-2021-26777 is a critical-severity vulnerability in Circutor Compact Dc-S Basic, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-12-02.
How severe is CVE-2021-26777?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-26777 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.