CVE-2021-31888 is a critical vulnerability affecting numerous Siemens APOGEE, Desigo, and TALON products, as well as the Nucleus NET and ReadyStart V3 embedded TCP/IP stacks. The vulnerability stems from improper length validation in the FTP server's "MKD/XMKD" command, leading to stack-based buffer overflows. With a CVSS score of 8.8 (High), this flaw allows for unauthenticated remote attackers to achieve Denial-of-Service and potentially Remote Code Execution with low attack complexity. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, highlighting its potential impact on critical systems.
| 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:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.