CVE-2025-11781: Use of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2

Routine

HIGH 7.8MITIGATEMITIGATE

CVE-2025-11781 is a high-severity flaw (CVSS 7.8) affecting sge-plc1000 firmware, sge-plc50 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. The affected firmware contains a hardcoded static authentication key. An attacker with local access to the device can extract this key (e.g., by analysing the firmware image or memory dump) and create valid firmware update packages. This bypasses all intended access controls and grants full administrative privileges.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-321
Published	2025-12-02
Last modified	2026-09-26

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: circutor

Last updated 2026-09-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-02 13:15 UTCPublished CVE record published
2026-09-26 00:10 UTCUpdated Record last modified

circutor sge-plc1000 firmware MITIGATE

Affected: 9.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

circutor sge-plc50 firmware MITIGATE

Affected: 9.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-11781?

sge-plc1000 firmware: mitigate or apply the listed mitigation; sge-plc50 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-11781 being exploited?

CVE-2025-11781 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-11781 affect?

CVE-2025-11781 affects sge-plc1000 firmware, sge-plc50 firmware. Severity is high (CVSS 7.8). Use of hardcoded cryptographic keys in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2. The affected firmware contains a hardcoded static authentication key. An attacker with local access to the device can extract this key (e.g., by analysing the fir

How urgent is CVE-2025-11781?

Priority 28/100. High severity

Related CVEs

CVE-2025-11779 CRITICAL 9.8 MITIGATE MITIGATE Stack-based buffer overflow vulnerability in CircutorSGE-PLC1000/SGE-PLC50 v9.0.2
CVE-2025-11783 CRITICAL 9.8 MITIGATE MITIGATE Stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2
CVE-2025-11782 CRITICAL 9.8 MITIGATE MITIGATE Stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2
CVE-2025-11784 CRITICAL 9.8 MITIGATE MITIGATE Stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2
CVE-2025-11786 CRITICAL 9.8 MITIGATE MITIGATE Stack-based buffer overflow vulnerability in Circutor SGE-PLC1000/SGE-PLC50 v9.0.2

References

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