Circutor SGE-PLC1000 improper authentication

published 2021-06-09 5y ago modified 2026-06-17 4mo ago also EUVD-2021-20516

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits: 0; none known

Improper Authentication vulnerability in the cookie parameter of Circutor SGE-PLC1000 firmware version 0.9.2b allows an attacker to perform operations as an authenticated user. In order to exploit this vulnerability, the attacker must be within the network where the device affected is located.

Is CVE-2021-33842 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.7	AV:A/AC:L/Au:S/C:C/I:C/A:C

Affected products

Circutor SGE-PLC1000

Classification

Weakness

CWE-565 Reliance on Cookies without Validation and Integrity Checking

References

incibe.es /en/incibe-cert/notices/aviso-sci/circutor-sge-plc1000-improper-authentication

Sources

CVE List CVE-2021-33842
NVD CVE-2021-33842

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.