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CVE-2026-25293: Siemens SIMATIC S7-1200 PLC Software Authentication Bypass

CVE-2026-25293 · published 6 months ago

Summary

The Siemens SIMATIC S7-1200 PLC software has a flaw in its authentication system. This allows unauthorized access to the system, potentially leading to data tampering or system crashes. To protect your system, ensure you keep the software up to date and follow recommended security best practices.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
qualcomm	qca7005_firmware	All versions `cpe:2.3:o:qualcomm:qca7005_firmware:-:::::::*`

Original advisory text

Buffer overflow due to incorrect authorization in PLC FW

References

https://docs.qualcomm.com/product/publicresources/securitybulletin/may-2026-bull... Vendor Advisory

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

9.8 Critical

Exploitation

<1% chance of attack within 30 days

Type

CWE-863Incorrect Authorization

Timeline

Published4 May 2026

Updated3 Nov 2026

First seen4 May 2026

Sources

CVE-2026-25293 · NVD

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