Message spoofing via collision-prone RC4 checksums
Published Apr 15, 2025 · Updated Sep 1, 2026
Use of a weak hash in MIT Kerberos 5 before 1.22 allows remote attackers to tamper with GSSAPI-protected messages over a network. The RFC 4757 checksum construction uses collision-prone MD5, letting altered messages retain the original Message Integrity Code. Exploitation requires access to captured traffic and a configuration that negotiates RC4-HMAC-MD5 instead of stronger encryption types.
Summary
What happened
Use of a weak hash in MIT Kerberos 5 before 1.22 allows remote attackers to tamper with GSSAPI-protected messages over a network. The RFC 4757 checksum construction uses collision-prone MD5, letting altered messages retain the original Message Integrity Code. Exploitation requires access to captured traffic and a configuration that negotiates RC4-HMAC-MD5 instead of stronger encryption types.
The record
- CVE
- CVE-2025-3576
- Published
- Apr 15, 2025
- Updated
- Sep 1, 2026
- Vendor
- Siemens
- Product
- RUGGEDCOM ROX RX1500
- Classifications
- CWE-328, T1565.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 15, 2025CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record 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=0 <V2.17.1
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.
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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