Out-of-bounds write in Siemens Nucleus Net
CVSS score
9.8
EPSS probability
%3.0
Risk score
0.3
Published
5 y ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2021-31886 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
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 Ethernet) (All versions), APOGEE PXC Compact (BACnet) (All versions < V3.5.4), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.4), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.19), Desigo PXC00-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC00-U (All versions >= V2.3 and < V6.30.016), Desigo PXC001-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC100-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC12-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC128-U (All versions >= V2.3 and < V6.30.016), Desigo PXC200-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC36.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC50-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC64-U (All versions >= V2.3 and < V6.30.016), Desigo PXM20-E (All versions >= V2.3 and < V6.30.016), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus Source Code (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). FTP server does not properly validate the length of the “USER” command, leading to stack-based buffer overflows. This may result in Denial-of-Service conditions and Remote Code Execution. (FSMD-2021-0010)
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2021-31886 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | siemens | nucleus net | View |
| 2 | siemens | nucleus readystart v3 | View |
| 3 | siemens | nucleus source code | View |
| 4 | siemens | apogee modular building controller firmware | View |
| 5 | siemens | apogee modular building controller | View |
| 6 | siemens | apogee modular equiment controller firmware | View |
| 7 | siemens | apogee modular equiment controller | View |
| 8 | siemens | apogee pxc compact firmware | View |
| 9 | siemens | apogee pxc compact firmware | View |
| 10 | siemens | apogee pxc compact | View |
| 11 | siemens | apogee pxc modular firmware | View |
| 12 | siemens | apogee pxc modular firmware | View |
| 13 | siemens | apogee pxc modular | View |
| 14 | siemens | talon tc compact firmware | View |
| 15 | siemens | talon tc compact | View |
| 16 | siemens | talon tc modular firmware | View |
| 17 | siemens | talon tc modular | View |
| 18 | siemens | desigo pxc00-e.d firmware | View |
| 19 | siemens | desigo pxc00-e.d | View |
| 20 | siemens | desigo pxc00-u firmware | View |
| 21 | siemens | desigo pxc00-u | View |
| 22 | siemens | desigo pxc001-e.d firmware | View |
| 23 | siemens | desigo pxc001-e.d | View |
| 24 | siemens | desigo pxc12-e.d firmware | View |
| 25 | siemens | desigo pxc12-e.d | View |
| 26 | siemens | desigo pxc22-e.d firmware | View |
| 27 | siemens | desigo pxc22-e.d | View |
| 28 | siemens | desigo pxc22.1-e.d firmware | View |
| 29 | siemens | desigo pxc22.1-e.d | View |
| 30 | siemens | desigo pxc36.1-e.d firmware | View |
| 31 | siemens | desigo pxc36.1-e.d | View |
| 32 | siemens | desigo pxc50-e.d firmware | View |
| 33 | siemens | desigo pxc50-e.d | View |
| 34 | siemens | desigo pxc64-u firmware | View |
| 35 | siemens | desigo pxc64-u | View |
| 36 | siemens | desigo pxc100-e.d firmware | View |
| 37 | siemens | desigo pxc100-e.d | View |
| 38 | siemens | desigo pxc128-u firmware | View |
| 39 | siemens | desigo pxc128-u | View |
| 40 | siemens | desigo pxc200-e.d firmware | View |
| 41 | siemens | desigo pxc200-e.d | View |
| 42 | siemens | desigo pxm20-e firmware | View |
| 43 | siemens | desigo pxm20-e | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.8 | CVSS V31 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD |
| 7.5 | CVSS V2 | — | AV:N/AC:L/Au:N/C:P/I:P/A:P | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-31886 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-31886 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
Get this vulnerability through the API
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