Tunnel traffic disclosure via skipped encryption module
Published Aug 5, 2025 · Updated Aug 5, 2025
Fail-open encryption handling in leakingmemory vtun-ng 3.0.12 through 3.0.17 allows remote attackers to read tunnel traffic as plaintext. In Linkfd::new, an encryption factory returning None is silently skipped, leaving the encode/decode chain active without its encryption module. An encryption-initialization failure is required; blowfish-256 guarantees that failure, exposing confidentiality without altering traffic or service availability.
Summary
What happened
Fail-open encryption handling in leakingmemory vtun-ng 3.0.12 through 3.0.17 allows remote attackers to read tunnel traffic as plaintext. In Linkfd::new, an encryption factory returning None is silently skipped, leaving the encode/decode chain active without its encryption module. An encryption-initialization failure is required; blowfish-256 guarantees that failure, exposing confidentiality without altering traffic or service availability.
The record
- CVE
- CVE-2025-54870
- Published
- Aug 5, 2025
- Updated
- Aug 5, 2025
- Vendor
- leakingmemory
- Product
- vtun-ng
- Classifications
- CWE-636, T1040
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 2025Record 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=>= 3.0.12, < 3.0.18
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.
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