EUVD-2026-24228CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionNVD
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.
AnalysisAI
Remote denial of service in Coturn TURN/STUN server allows unauthenticated attackers to crash ARM64 deployments with a single malformed UDP packet. The vulnerability triggers a fatal SIGBUS signal via misaligned memory access during STUN attribute parsing, requiring no authentication or special configuration. …
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RemediationAI
Within 24 hours: Identify all ARM64-based Coturn deployments in your infrastructure and document their version numbers and network exposure. Within 7 days: Implement network-layer filtering on UDP ports used by Coturn (typically 3478-3479) to restrict traffic to trusted sources only, and deploy monitoring for abnormal process crashes. …
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