Traffic interception via default weak SSH ciphers
Published Apr 11, 2023 · Updated Feb 7, 2025
Weak SSH encryption in Siemens SCALANCE X-200IRT devices before 5.5.2 allows man-in-the-middle attackers to read and modify traffic. The devices' SSH servers offer weak ciphers by default, allowing a negotiated connection to use inadequate encryption rather than restricting negotiation to strong algorithms. Exploitation requires interception between a legitimate SSH client and the device, and it exposes both the confidentiality and integrity of data carried by that connection.
Summary
What happened
Weak SSH encryption in Siemens SCALANCE X-200IRT devices before 5.5.2 allows man-in-the-middle attackers to read and modify traffic. The devices' SSH servers offer weak ciphers by default, allowing a negotiated connection to use inadequate encryption rather than restricting negotiation to strong algorithms. Exploitation requires interception between a legitimate SSH client and the device, and it exposes both the confidentiality and integrity of data carried by that connection.
The record
- CVE
- CVE-2023-29054
- Published
- Apr 11, 2023
- Updated
- Feb 7, 2025
- Vendor
- Siemens
- Product
- SCALANCE X204IRT PRO
- Classifications
- CWE-326, T1557, T1565.002
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 11, 2023CVE publishedPublication date reported by the CVE source.
- Feb 7, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=All versions < V5.5.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
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Technologies
Your stack
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Your stack
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