EUVD-2026-24228Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
7DescriptionGitHub Advisory
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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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires Coturn deployment running on ARM64 (AArch64) architecture with strict alignment enforcement. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This represents a high-severity availability threat with extremely low exploitation complexity against a specific architectural deployment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies an ARM64-based Coturn server exposed on the public internet, typically through banner grabbing on UDP port 3478 or by observing WebRTC infrastructure in browser developer tools. The attacker crafts a STUN Binding Request message with attribute boundaries positioned at odd byte offsets, violating 16-bit alignment requirements for ARM64 memory access. … |
| Remediation | Upgrade Coturn to version 4.10.0 or later, which includes fixes for unsafe pointer casting in STUN attribute parsing functions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all ARM64-based Coturn deployments in your infrastructure and document their version numbers and network exposure. …
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