CVE-2026-27663

mediumpriority · track · 0EPSS 0.003 · 21 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.28% (21st) EPSS

CVSS 6.5 · medium

Is it mine?

12 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · cisa_csaf_ot

EPSS · scored 2026-10-27

A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.10), RTUM85 RTU Base (All versions < V26.10). The affected application contains denial-of-service (DoS) vulnerability. The remote operation mode is susceptible to a resource exhaustion condition when subjected to a high volume of requests. Sending multiple requests can exhaust resources, preventing parameterization and requiring a reset or reboot to restore functionality.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCPCI85 Central Processing/Communicationsiemens_psirt
Update to V26.10 or later version The firmware CPCI85 V26.10 is present within “CP-8031/CP-8050 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109804985/ and also within “SICAM EGS Package” V26.10 https://support.industry.siemens.com/cs/document/109972536/
FixedRTUM85 RTU Basesiemens_psirt
Update to V26.10 or later version The firmware RTUM85 V26.10 is present within “CP-8010/CP-8012 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109972894/ and also within “SICAM S8000 Package” V26.10 https://support.industry.siemens.com/cs/document/109818240
FixedCPCI85 Central Processing/Communicationcisa_csaf_ot
Update to V26.10 or later version The firmware CPCI85 V26.10 is present within “CP-8031/CP-8050 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109804985/ and also within “SICAM EGS Package” V26.10 https://support.industry.siemens.com/cs/document/109972536/
FixedRTUM85 RTU Basecisa_csaf_ot
Update to V26.10 or later version The firmware RTUM85 V26.10 is present within “CP-8010/CP-8012 Package” V26.10 https://support.industry.siemens.com/cs/ww/en/view/109972894/ and also within “SICAM S8000 Package” V26.10 https://support.industry.siemens.com/cs/document/109818240

cvss

Technical severity, 0–10. One row per scoring source.

7.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · productcert@siemens.com DEexploitability 2.8 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Siemens ProductCERT DE

v4.07.1highCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.07.1highCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · productcert@siemens.com DE

v4.04.9mediumCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770USCWE-770US

affected products (12)

Products and version ranges known to be affected.

Siemens SICAM CPCI85 <26.10all versionscert_bundDE
Siemens SICAM RTUM85 <26.10all versionscert_bundDE
Siemens SICAM≤ CPCI85 <26.10cert_bundDE
Siemens SICAM≤ RTUM85 <26.10cert_bundDE
CPCI85 Central Processing/Communicationall versionscisa_csaf_otUS
RTUM85 RTU Baseall versionscisa_csaf_otUS
Siemens CPCI85 Central Processing/Communication≤ vers:intdot/<26.10cisa_csaf_otUS
Siemens RTUM85 RTU Base≤ vers:intdot/<26.10cisa_csaf_otUS
Siemens CPCI85 Central Processing/Communication0 → V26.10enisa_euvdEU
Siemens RTUM85 RTU Base0 → V26.10enisa_euvdEU
Siemens CPCI85 Central Processing/Communication≤ vers:intdot/<26.10siemens_psirtDE
Siemens RTUM85 RTU Base≤ vers:intdot/<26.10siemens_psirtDE

advisories (3)

Vendor and ecosystem advisories describing this.

SSA-246443SSA-246443: Multiple Vulnerabilities in SICAM 8 Products2026-03-26csaf · siemens_psirtDE
Multiple SICAM 8 products are affected by multiple vulnerabilities that could lead to denial of service, namely: - SICAM A8000 Device firmware - CPCI85 for CP-8031/CP-8050 - SICORE for CP-8010/CP-8012 - RTUM85 for CP-8010/CP-8012 - SICAM EGS Device firmware - CPCI85 - SICAM S8000 - SICORE - RTUM85 Siemens has released new versions for the affected products and recommends to update to the latest versions.
WID-SEC-W-2026-0889Siemens SICAM: Mehrere Schwachstellen ermöglichen Denial of ServiceDeutsch2026-03-26csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Siemens SICAM ausnutzen, um einen Denial of Service Angriff durchzuführen.
ICSA-26-092-01Siemens SICAM 8 Products2026-03-26icsa · cisa_csaf_otUS
Multiple SICAM 8 products are affected by multiple vulnerabilities that could lead to denial of service, namely: - SICAM A8000 Device firmware - CPCI85 for CP-8031/CP-8050 - SICORE for CP-8010/CP-8012 - RTUM85 for CP-8010/CP-8012 - SICAM EGS Device firmware - CPCI85 - SICAM S8000 - SICORE - RTUM85 Siemens has released new versions for the affected products and recommends to update to the latest versions.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund cisa_csaf_ot siemens_psirt NVD CVE.org MITRE

published 2026-03-26modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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