CVE-2021-31889

HIGH

Capital Embedded AR Classic - Information Leak and Denial of Service via Malformed TCP SACK Option

Title source: llm
STIX 2.1

Description

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

References (10)

Core 10
Core References

Scores

CVSS v3 7.5
EPSS 0.0158
EPSS Percentile 81.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-191
Status published
Products (10)
siemens/apogee_modular_building_controller_firmware
siemens/apogee_modular_equiment_controller_firmware
siemens/apogee_pxc_compact_firmware
siemens/apogee_pxc_modular_firmware
siemens/capital_vstar
siemens/nucleus_net
siemens/nucleus_readystart_v3 < 2017.02.3
siemens/nucleus_source_code
siemens/talon_tc_compact_firmware
siemens/talon_tc_modular_firmware
Published Nov 09, 2021
Tracked Since Feb 18, 2026