CVE Tools
Track your stack

CVE-2021-31885

A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BACnet) (All versions), APOGEE MEC (PPC) (P2 Ethern...

No known exploitation. EPSS puts it in the 69th percentile. A vendor fix is available.

CVSS 3.17.5HighEPSS percentile69th1.2% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixVendor fixNo build named by the sources

Published Updated Sources: CVE.org, NVD, BDU, CSAF

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

  • Siemens Nucleus ReadyStart V3Affected: All versions < V2017.02.4Upgrade to: not statedStated by: CVE record
  • Siemens Nucleus ReadyStart V4Affected: All versions < V4.1.1Upgrade to: not statedStated by: CVE record
  • Siemens Desigo PXC00-E.DAffected: All versions >= V2.3 and < V6.30.016Upgrade to: not statedStated by: CVE record
  • Siemens Desigo PXC00-UAffected: All versions >= V2.3 and < V6.30.016Upgrade to: not statedStated by: CVE record
  • Siemens Desigo PXC12-E.DAffected: All versions >= V2.3 and < V6.30.016Upgrade to: not statedStated by: CVE record

Versions as the sources state them. 23 more products have version data. Full version matrix after sign-in

Is your organisation exposed?Request an assessment to establish which checks fit your systems.

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. The products listed below use affected versions of the Nucleus software and inherently contain these vulnerabilities. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not, or not yet 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.

EPSS69th
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

1.2% chance of exploitation activity in the next 30 days, which ranks it in the 69th 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.

  1. Patch availablerecord updated
  2. Publishedweakness classified

Affected products

And 57 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 HighTotal information disclosure — all data in the component is compromised
  • Integrity NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

And 28 more references. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Nucleus NET, not every advisory.