CVE-2019-13939 · threatengine.sh

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CVE-2019-139391

A vulnerability has been identified in APOGEE MEC/MBC/PXC (P2) (All versions < V2.8.2), APOGEE PXC Compact (BACnet) (All

A vulnerability has been identified in APOGEE MEC/MBC/PXC (P2) (All versions < V2.8.2), APOGEE PXC Compact (BACnet) (All versions < V3.5.3), APOGEE PXC Compact (P2 Ethernet) (All versions >= V2.8.2 < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.3), APOGEE PXC Modular (P2 Ethernet) (All versions >= V2.8.2 < V2.8.19), Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Desigo PXC00-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC00-U (All versions >= V2.3x and < V6.00.327), Desigo PXC001-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC100-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC12-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC128-U (All versions >= V2.3x and < V6.00.327), Desigo PXC200-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC22-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC22.1-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC36.1-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC50-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC64-U (All versions >= V2.3x and < V6.00.327), Desigo PXM20-E (All versions >= V2.3 < V6.0.327), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus Source Code (All versions), SIMOTICS CONNECT 400 (All versions < V0.3.0.330), TALON TC Compact (BACnet) (All versions < V3.5.3), TALON TC Modular (BACnet) (All versions < V3.5.3). By sending specially crafted DHCP packets to a device where the DHCP client is enabled, an attacker could change the IP address of the device to an invalid value.

HIGH · CVSS 7.1 EPSS 0.00715

EPSS exploitation odds0.71% · top 50%

Act now

Public exploit or PoC is available
CVSS base score ≥ 7.0

No Sigma yet — build one → YARA rules0

Look this up elsewhere - one-click external pivots

NVD CVE.org CISA Exploit-DB GitHub PoC VulnCheck KEV GreyNoise

▸ How to read a CVE - triage first, then detect and patch

This page is every public fact about CVE-2019-13939, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.

Triage: should I act now? Four signals, and they are not interchangeable:

CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked. EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal. CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score. Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.

How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.

Then what - two workflows:

Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits. PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.

Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).

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Exploitation evidence

1 of 7 sources

Corroboration score 8/100 · emerging. This counts how many independent sources have exploitation evidence, and separates two different things: confirmed in-the-wild use (CISA KEV, Microsoft MSRC, ransomware activity) from exploit / PoC availability (Metasploit, ExploitDB, Nuclei, public PoCs). A template or PoC existing means an attack is possible and easy - it is not, on its own, proof the CVE is being exploited in the wild.

Exploit / PoC available

public PoC

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Exploitation momentum

496 days of EPSS

dormant

Flat and low - no real exploitation pressure. This reads the direction and speed of EPSS over time, which can move before EPSS itself peaks or before CISA lists it.

Window

EPSS 0.006 → 0.007 peak 0.007 velocity +0.000

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Severity & exploitation scoring

View on NVD →

CVSS base score

7.1

HIGHCVSS v3.1 · [email protected]

EPSS exploitation probability

0.71%

Top 50%odds of exploitation in the next 30 days

CVSS metric silhouette

shape grows toward worst-case

SSVC triage

No SSVC vulnrichment for this CVE. CISA's Vulnrichment program scores newer CVEs (~2024 onwards) plus selected older critical ones. Use the EPSS probability + KEV status to triage instead.

CVSS vector breakdown

Exploitability - how they get in

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Impact - what breaks

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

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

Lifecycle

16 Jan 2020Published to NVD
17 Jun 2026Last modified

Every entry is a recorded date - NVD publish/modify, CISA KEV add, public exploit disclosure. No inferred events.

Attack path

Full kill chain

→

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Public Exploits & PoCs

These PoC and exploit links come from public sources and are not verified to be safe or functional. Review the code before running anything, and treat unverified entries as untrusted. Signed-in users mark whether it works, rate 1-10, and can report malware with a required reason that becomes a public comment.

poc fkie-cad/nvd-json-data-feeds (trickest)↗ date unknown

Works? no reports yet

Rating -

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ATT&CK techniques

Techniques this CVE enables. Pills with a solid outline are high confidence - named directly in ATT&CK or Nuclei, or human-curated by CTID; the rest are inferred from the weakness type using MITRE's CVE Mapping Methodology and the CWE → CAPEC chain. Broad, generic-weakness guesses are filtered out. A small N× marks a technique that N independent sources agree on.

T1210 · Exploitation of Remote Services

▤ Build a SIEM detection for these techniques

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CAPEC attack patterns

Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.

CAPEC-CAPEC-10 · Buffer Overflow via Environment Variables CAPEC-CAPEC-101 · Server Side Include (SSI) Injection CAPEC-CAPEC-104 · Cross Zone Scripting CAPEC-CAPEC-108 · Command Line Execution through SQL Injection CAPEC-CAPEC-109 · Object Relational Mapping Injection CAPEC-CAPEC-110 · SQL Injection through SOAP Parameter Tampering CAPEC-CAPEC-120 · Double Encoding CAPEC-CAPEC-13 · Subverting Environment Variable Values CAPEC-CAPEC-135 · Format String Injection CAPEC-CAPEC-136 · LDAP Injection CAPEC-CAPEC-14 · Client-side Injection-induced Buffer Overflow CAPEC-CAPEC-153 · Input Data Manipulation

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Weakness Classification

CWE-20Improper Input Validation

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Affected Products & Versions

siemens capital vstarall versions
siemens nucleus netall versions
siemens nucleus readystart< 2017.02.2
siemens nucleus safetycertall versions
siemens nucleus source codeall versions
siemens nucleus rtosall versions
siemens apogee modular equiment controller firmware< 2.8.2
siemens apogee modular building controller firmware< 2.8.2
siemens apogee pxc firmware<= 2.8.2
siemens desigo pxc firmware>= 2.3
siemens desigo pxm20 firmware>= 2.3
siemens simotics connect 400 firmware<= 0.3.0.95
siemens talon tc firmware>= 3.0
siemens desigo pxc00-e.d firmware>= 2.3.0 and < 6.00.327
siemens desigo pxc00-u firmware>= 2.3.0 and < 6.00.327
siemens desigo pxc001-e.d firmware>= 2.3.0 and < 6.00.327
siemens desigo pxc12-e.d firmware>= 2.3.0 and < 6.00.327
siemens desigo pxc22-e.d firmware>= 2.3.0 and < 6.00.327
siemens desigo pxc22.1-e.d firmware>= 2.3.0 and < 6.00.327
siemens desigo pxc36.1-e.d firmware>= 2.3.0 and < 6.00.327
siemens desigopxc50-e.d firmwareall versions
siemens desigopxc64-u firmwareall versions
siemens desigopxc100-e.d firmwareall versions
siemens desigopxc128-u firmwareall versions
siemens desigopxc200-e.d firmwareall versions
siemens desigopxm20-e firmwareall versions

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Related CVEs

CVEs linked to this one by a shared weakness (CWE) or affected product - joins on data already in the engine, with the reason shown per row.

CVE-1999-0265 ICMP redirect messages may crash or lock up a host. same CWE-20 CVE-1999-0726 An attacker can conduct a denial of service in Windows NT by executing a program... same CWE-20 CVE-1999-0918 Denial of service in various Windows systems via malformed, fragmented IGMP pack... 3 same CWE-20 CVE-1999-0721 Denial of service in Windows NT Local Security Authority (LSA) through a malform... same CWE-20 CVE-2020-28388 A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions... same product MEDIUM CVE-2021-31344 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All ... same product MEDIUM CVE-2021-31345 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All ... same product HIGH CVE-2021-31346 A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All ... same product HIGH

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Vendor Advisories

siemens-csafSSA-162506
siemens-csafSSA-434032
cisa-csafcisa-csaf-csaf_files-OT-white-2019-icsa-19-318-01
cisa-csafcisa-csaf-csaf_files-OT-white-2020-icsa-20-105-06

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