CVE-2025-40808

unknowncovered by 1 sourcefirst seen 2026-06-23

View CSAF Summary SIPROTEC 5 is vulnerable to arbitrary file uploads by authenticated users using the DIGSI 5 protocol. This could allow an attacker to upload malicious configuration files, potentially causing a permanent denial of service condition. As a mitigation measure, users of the CP050 and CP150 device models are advised to upgrade to version 9.90 or later. For CP300 device models, devices 7ST85 and 7ST86 are advised to upgrade to version 10.00 or later, while the remaining models should upgrade to version 9.90 or later. These versions introduce an allow-list feature that restricts arbitrary file uploads and reduces the risk associated with this vulnerability. Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens SIPROTEC 5 Using DIGSI5 Protocol are affected: SIPROTEC 5 6MD84 (CP300) vers:all/* SIPROTEC 5 6MD85 (CP200) vers:all/* SIPROTEC 5 6MD85 (CP300) vers:all/* SIPROTEC 5 6MD86 (CP200) vers:all/* SIPROTEC 5 6MD86 (CP300) vers:all/* SIPROTEC 5 6MD89 (CP300) vers:all/* SIPROTEC 5 6MU85 (CP300) vers:all/* SIPROTEC 5 7KE85 (CP200) vers:all/* SIPROTEC 5 7KE85 (CP300) vers:all/* SIPROTEC 5 7SA82 (CP100) vers:all/* SIPROTEC 5 7SA82 (CP150) vers:all/* SIPROTEC 5 7SA86 (CP200) vers:all/* SIPROTEC 5 7SA86 (CP300) vers:all/* SIPROTEC 5 7SA87 (CP200) vers:all/* SIPROTEC 5 7SA87 (CP300) vers:all/* SIPROTEC 5 7SD82 (CP100) vers:all/* SIPROTEC 5 7SD82 (CP150) vers:all/* SIPROTEC 5 7SD86 (CP200) vers:all/* SIPROTEC 5 7SD86 (CP300) vers:all/* SIPROTEC 5 7SD87 (CP200) vers:all/* SIPROTEC 5 7SD87 (CP300) vers:all/* SIPROTEC 5 7SJ81 (CP100) vers:all/* SIPROTEC 5 7SJ81 (CP150) vers:all/* SIPROTEC 5 7SJ82 (CP100) vers:all/* SIPROTEC 5 7SJ82 (CP150) vers:all/* SIPROTEC 5 7SJ85 (CP200) vers:all/* SIPROTEC 5 7SJ85 (CP300) vers:all/* SIPROTEC 5 7SJ86 (CP200) vers:all/* SIPROTEC 5 7SJ86 (CP300) vers:all/* SIPROTEC 5 7SK82 (CP100) vers:all/* SIPROTEC 5 7SK82 (CP150) vers:al

CSIRTS triage

vendor: Siemens product: SIPROTEC 5Otheraffected: CP050 and CP150 models to version 9.90 or later; CP300 models to version 10.00 or later

What: Vulnerability allows arbitrary file uploads by authenticated users, potentially causing denial of service.
Who is affected: Users of SIPROTEC 5 device models.
Urgency: Remediation is important to prevent potential denial of service conditions.
Action: Upgrade to the specified versions of SIPROTEC 5.

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Exploitation outlook

Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownSiemens SIPROTEC 5 Using DIGSI5 Protocolcisa · 2026-06-23

External references

NVD record for CVE-2025-40808

CVE.org record

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