Unauthenticated memory disclosure via malformed TFTP commands
Published Nov 9, 2021 · Updated Aug 3, 2024
Incorrect-length buffer access in Siemens Nucleus-based products allows remote attackers to read TFTP memory via malformed commands. The TFTP server processes attacker-controlled command lengths without enforcing the memory-buffer boundary, returning unintended contents. No authentication or user interaction is required; the reported consequence is limited to information readable from TFTP process memory.
Summary
What happened
Incorrect-length buffer access in Siemens Nucleus-based products allows remote attackers to read TFTP memory via malformed commands. The TFTP server processes attacker-controlled command lengths without enforcing the memory-buffer boundary, returning unintended contents. No authentication or user interaction is required; the reported consequence is limited to information readable from TFTP process memory.
The record
- CVE
- CVE-2021-31885
- Published
- Nov 9, 2021
- Updated
- Aug 3, 2024
- Vendor
- Siemens
- Product
- TALON TC Compact (BACnet)
- Classifications
- CWE-805, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 9, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=All versions < V3.5.4
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo