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Vulnerability record · CVE-2021-33842 · published 9 June 2021

CVE-2021-33842: Circutor sge-plc1000 firmware reliance on cookies without validation vulnerability

Circutor · Sge Plc1000 Firmware

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.

8.8 CVSS 3.1 High EPSS 0.43% · top 65.5% CWE-565 · Reliance on cookies without validation
8.8CVSS 3.1 base score, v2 7.7
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.incibe.es/en/incibe-cert/notices/aviso-sci/circutor-sge-plc1000-improper-authentication
https://www.incibe.es/en/incibe-cert/notices/aviso-sci/circutor-sge-plc1000-improper-authentication

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-11778Circutor sge-plc1000 firmware heap-based buffer overflow vulnerabilityStack-based buffer overflow in Circutor SGE-PLC1000/SGE-PLC50 v0.9.2. This vulnerability allows an attacker to remotely exploit memory corruption thr…EPSS 0.35%9.8CVE-2021-33841Circutor sge-plc1000 firmware os command injection vulnerabilitySGE-PLC1000 device, in its 0.9.2b firmware version, does not handle some requests correctly, allowing a remote attacker to inject code into the opera…EPSS 2.2%9.4CVE-2025-11779Circutor sge-plc1000 firmware stack-based buffer overflow vulnerabilityStack-based buffer overflow vulnerability in CircutorSGE-PLC1000/SGE-PLC50 v9.0.2. The 'SetLan' function is invoked when a new configuration is appli…EPSS 1.3%8.7CVE-2025-11780Circutor sge-plc1000 firmware classic buffer overflow vulnerabilityStack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. In the 'showMeterReport()' function, there is an unlimited user i…EPSS 0.33%8.6CVE-2025-11781Circutor sge-plc1000 firmware vulnerabilityUse of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. The affected firmware contains a hardcoded static authentication key. A…EPSS 0.14%8.5CVE-2025-11788Circutor sge-plc1000 firmware heap-based buffer overflow vulnerabilityHeap-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. In the 'ShowSupervisorParameters()' function, there is an unlimite…EPSS 0.33%8.5CVE-2025-11785Circutor sge-plc1000 firmware stack-based buffer overflow vulnerabilityStack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. In the 'ShowMeterPasswords()' function, there is an unlimited use…EPSS 0.37%8.5CVE-2025-11786Circutor sge-plc1000 firmware stack-based buffer overflow vulnerabilityStack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. In the 'SetUserPassword()' function, the 'newPassword' parameter …EPSS 0.37%

Source: NIST National Vulnerability Database (record CVE-2021-33842), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.