CVE-2021-31886 is a critical vulnerability affecting numerous Siemens APOGEE, Desigo, and TALON products, as well as the Nucleus embedded TCP/IP stack. It stems from improper validation of the "USER" command length in the FTP server, leading to stack-based buffer overflows. This flaw carries a CVSS score of 9.8 (Critical) due to its network-based attack vector, low attack complexity, and potential for Denial-of-Service and Remote Code Execution, allowing attackers full control over affected systems. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community attention and media coverage, indicating a high level of concern.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
All Versions ImpactedCPE matchmatch criteria | cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:* | ||
< 2017.02.4CPE matchmatch criteria | cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:* | ||
All Versions ImpactedCPE matchmatch criteria | cpe:2.3:a:siemens:nucleus_source_code:*:*:*:*:*:*:*:* | ||
All Versions ImpactedCPE matchmatch criteria | cpe:2.3:o:siemens:apogee_modular_building_controller_firmware:*:*:*:*:*:*:*:* | ||
All Versions ImpactedCPE matchmatch criteria | cpe:2.3:o:siemens:apogee_modular_equiment_controller_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.