Cyber Resilience

CVE-2021-31889

High

Published: 09 November 2021

Published
09 November 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0158 82.0th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-31889 is a high-severity Wrap or Wraparound (CWE-191) vulnerability in Siemens Apogee Modular Building Controller Firmware. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 18.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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 CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted…

more

SACK option leads to Information Leaks and Denial-of-Service conditions. (FSMD-2021-0015)

CWE(s)
CWE-191

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

siemens
capital vstar
all versions
siemens
nucleus net
all versions
siemens
nucleus readystart v3
≤ 2017.02.3
siemens
nucleus source code
all versions
siemens
apogee modular building controller firmware
all versions
siemens
apogee modular equiment controller firmware
all versions
siemens
apogee pxc compact firmware
all versions
siemens
apogee pxc modular firmware
all versions
siemens
talon tc compact firmware
all versions
siemens
talon tc modular firmware
all versions

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References