Service disruption via predictable nonce and port randomization
Published Dec 30, 2025 · Updated Dec 30, 2025
Predictable randomness in coturn 4.6.2r5 through 4.7.0-r4 allows remote authenticated users to spoof TURN messages and disrupt service. The turn_random() path in apputils.c uses libc random() instead of OpenSSL RAND_bytes on non-Windows systems, so about 50 sequential allocation nonces expose enough PRNG state to predict later nonces and relay ports. Exploitation requires known TURN credentials after state recovery; bounded consequences include forged permission or binding changes, relay tracking, and amplified loop traffic that interrupts availability.
Summary
What happened
Predictable randomness in coturn 4.6.2r5 through 4.7.0-r4 allows remote authenticated users to spoof TURN messages and disrupt service. The turn_random() path in apputils.c uses libc random() instead of OpenSSL RAND_bytes on non-Windows systems, so about 50 sequential allocation nonces expose enough PRNG state to predict later nonces and relay ports. Exploitation requires known TURN credentials after state recovery; bounded consequences include forged permission or binding changes, relay tracking, and amplified loop traffic that interrupts availability.
The record
- CVE
- CVE-2025-69217
- Published
- Dec 30, 2025
- Updated
- Dec 30, 2025
- Vendor
- coturn
- Product
- coturn
- Classifications
- CWE-338, T1498
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 30, 2025CVE publishedPublication date reported by the CVE source.
- Dec 30, 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=>= 4.6.2r5, <= 4.7.0-r4
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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