CVE-2022-31807

mediumpriority · track · 22EPSS 0.002 · 5 %ileDEEUNLUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.16% (5th) EPSS
CVSS 5.5 · medium
Is it mine?
40 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · cisa_csaf_ot · ncsc_nl

EPSS · scored 2026-10-28

A vulnerability has been identified in Building X - Security Manager Edge Controller (ACC-AP) (All versions). Affected devices do not properly check the integrity of firmware updates. This could allow a local attacker to upload a maliciously modified firmware onto the device. In a second scenario, a remote attacker who is able to intercept the transfer of a valid firmware from the server to the device could modify the firmware "on the fly".

01

remediations

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

No vendor fix yet; a mitigation is available.

  • MitigationSiPass integrated AC5102 (ACC-G2)siemens_psirt

    Enable TLS for communication between servers and affected devices; this mitigates the risk of on-path attackers that intercept and modify the firmware during transmission

  • MitigationSiPass integrated ACC-APsiemens_psirt

    Enable TLS for communication between servers and affected devices; this mitigates the risk of on-path attackers that intercept and modify the firmware during transmission

  • MitigationBuilding X - Security Manager Edge Controller (ACC-AP)siemens_psirt

    Use the ACC Firmware App to apply updates in a controlled and authenticated manner, ensuring that only verified firmware packages from the official SIOS portal are installed on the controller. Validate the integrity of the downloaded firmware by confirming its hash value. Access to the controller should remain limited to authorized personnel, and credentials must be protected and updated according to policy to reduce the risk of unauthorized modifications or the installation of tampered firmware

  • MitigationSiPass integrated AC5102 (ACC-G2)cisa_csaf_ot

    Enable TLS for communication between servers and affected devices; this mitigates the risk of on-path attackers that intercept and modify the firmware during transmission

  • MitigationSiPass integrated ACC-APcisa_csaf_ot

    Enable TLS for communication between servers and affected devices; this mitigates the risk of on-path attackers that intercept and modify the firmware during transmission

  • MitigationBuilding X - Security Manager Edge Controller (ACC-AP)cisa_csaf_ot

    Use the ACC Firmware App to apply updates in a controlled and authenticated manner, ensuring that only verified firmware packages from the official SIOS portal are installed on the controller. Validate the integrity of the downloaded firmware by confirming its hash value. Access to the controller should remain limited to authorized personnel, and credentials must be protected and updated according to policy to reduce the risk of unauthorized modifications or the installation of tampered firmware

  • No fix plannedSiPass integrated AC5102 (ACC-G2)siemens_psirt

    Currently no fix is planned

  • No fix plannedSiPass integrated ACC-APsiemens_psirt

    Currently no fix is planned

  • No fix plannedBuilding X - Security Manager Edge Controller (ACC-AP)siemens_psirt

    Currently no fix is planned

  • No fix plannedSiPass integrated AC5102 (ACC-G2)cisa_csaf_ot

    Currently no fix is planned

  • No fix plannedSiPass integrated ACC-APcisa_csaf_ot

    Currently no fix is planned

  • No fix plannedBuilding X - Security Manager Edge Controller (ACC-AP)cisa_csaf_ot

    Currently no fix is planned

02

cvss

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

6.2
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–6.2

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 3.6
v3.16.2mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · CISA US
v3.16.2mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · NCSC-NL NL
v3.16.2mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · productcert@siemens.com DEexploitability 2.5 · impact 3.6
v3.16.2mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · Siemens ProductCERT DE
v4.05.9mediumCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.05.9mediumCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/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
v4.02.1lowCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/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)
03

ssvc

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

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-347USCWE-347USCWE-347USCWE-347US
05

affected products (40)

Products and version ranges known to be affected.

showing 20 of 40
06

advisories (5)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0382Kwetsbaarheden verholpen in Siemens productenNL2025-12-09csaf · ncsc_nlNL

    Siemens heeft kwetsbaarheden verholpen in diverse producten als Building X, COMOS, Energy Services, Gridscale X, NX, RUGGEDCOM, SICAM, SIMATIC, SINEC, SINEMA, SIPLUS en Solid Edge.

  • SSA-367714SSA-367714: Improper Integrity Check of Firmware Updates in SiPass integrated AC5102 / ACC-G2 and ACC-AP2025-05-23csaf · siemens_psirtDE

    SiPass integrated ACC (Advanced Central Controller) devices do not properly check the integrity of firmware updates. This could allow an attacker to upload a maliciously modified firmware onto the device. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

  • SSA-420375SSA-420375: Improper Integrity Check of Firmware Updates in Building X - Security Manager Edge Controller (ACC-AP)2025-12-09csaf · siemens_psirtDE

    Building X - Security Manager Edge Controller (ACC-AP) devices do not properly check the integrity of firmware updates. This could allow an attacker to upload a maliciously modified firmware onto the device. Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.

  • ICSA-25-148-01Siemens SiPass2025-05-23icsa · cisa_csaf_otUS

    SiPass integrated ACC (Advanced Central Controller) devices do not properly check the integrity of firmware updates. This could allow an attacker to upload a maliciously modified firmware onto the device. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

  • ICSA-25-345-07Siemens Building X - Security Manager Edge Controller2025-12-09icsa · cisa_csaf_otUS

    Building X - Security Manager Edge Controller (ACC-AP) devices do not properly check the integrity of firmware updates. This could allow an attacker to upload a maliciously modified firmware onto the device. Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otncsc_nlsiemens_psirtNVDCVE.orgMITRE
published 2025-05-23modified 2026-06-17
09

references (8)

External citations — patches, advisories, analysis.

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