CVE-2021-31890
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CO...
No known exploitation. EPSS puts it in the 82nd percentile. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
Multiple vulnerabilities (also known as "NUCLEUS:13") have been identified in the Nucleus RTOS (real-time operating system) and reported in the Siemens Security Advisory SSA-044112: https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf. PLUSCONTROL 1st Gen devices are affected by some of the vulnerabilities as documented below. Siemens Energy recommends specific countermeasures for products where updates are not available.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
2.2% chance of exploitation activity in the next 30 days, which ranks it in the 82nd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
4 events over 1108 days, from the signal feeds we watch.
- Patch availablerecord updated
- Publishedweakness classified
Affected products
- capital vstarICS / OT / IoT
- Nucleus NETICS / OT / IoT
- NUCLEUS READYSTART v3ICS / OT / IoT
- NUCLEUS READYSTART v4ICS / OT / IoT
- Nucleus Source CodeICS / OT / IoT
- apogee modular building controller firmwareICS / OT / IoT
- apogee modular equiment controller firmwareICS / OT / IoT
- apogee pxc compact firmwareICS / OT / IoT
And 22 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Scored 7.5 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity NoneNo integrity impact
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
Sources
References in the record
- cert-portal.siemens.com/productcert/csaf/ssa-845392.json
- cert-portal.siemens.com/productcert/txt/ssa-845392.txt
- cert-portal.siemens.com/productcert/pdf/ssa-845392.pdf
And 24 more references. See all after sign-in
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