CVE-2020-27738
A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3...
No known exploitation. EPSS puts it in the 89th 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
APOGEE PXC / TALON TC field panels (BACnet before V3.5.5 and P2 Ethernet before V2.8.20) contain multiple vulnerabilities: - CVE-2022-45937: A privilege management vulnerability that could allow low privilege authenticated attackers to gain high privilege access. - CVE-2020-28388: Predictable Initial Sequence Numbers in the TCP/IP Stack of Nucleus RTOS (real-time operating system) used by the affected products. - Several vulnerabilities in the DNS (domain name service) implementation of Nucleus RTOS. Siemens has released updates for the affected products and recommends to update to the latest versions.
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
3.7% chance of exploitation activity in the next 30 days, which ranks it in the 89th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
5 events over 1309 days, from the signal feeds we watch.
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
- APOGEE PXC Compact (BACnet)ICS / OT / IoT
- APOGEE PXC Compact (P2 Ethernet)ICS / OT / IoT
- APOGEE PXC Modular (BACnet)ICS / OT / IoT
- APOGEE PXC Modular (P2 Ethernet)ICS / OT / IoT
- Nucleus NETICS / OT / IoT
- Nucleus ReadyStart V3ICS / OT / IoT
- Nucleus ReadyStart V4ICS / OT / IoT
- Nucleus Source CodeICS / OT / IoT
And 9 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Scored 6.5 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- 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 LowSome restricted information is disclosed, but limited in scope
- Integrity NoneNo integrity impact
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
- Initial AccessT1190Exploit Public-Facing Applicationhigh confidence
- Privilege EscalationT1068Exploitation for Privilege Escalationhigh confidence
Sources
References in the record
- cert-portal.siemens.com/productcert/csaf/ssa-180579.json
- cert-portal.siemens.com/productcert/html/ssa-180579.html
- cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf
And 15 more references. See all after sign-in
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