CVE-2026-73214 (GCVE-0-2026-73214)
Vulnerability from cvelistv5 – Published: 2026-08-11 17:34 – Updated: 2026-08-11 17:34
VLAI
EPSS
VEX
Title
coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS
Summary
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.
Severity
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/coturn/coturn/security/advisor… | x_refsource_CONFIRM |
| https://github.com/coturn/coturn/pull/2003 | x_refsource_MISC |
| https://github.com/coturn/coturn/pull/2012 | x_refsource_MISC |
| https://github.com/coturn/coturn/commit/37e13d1d6… | x_refsource_MISC |
| https://github.com/coturn/coturn/commit/beb4de9dc… | x_refsource_MISC |
| https://github.com/coturn/coturn/releases/tag/4.16.0 | x_refsource_MISC |
{
"containers": {
"cna": {
"affected": [
{
"product": "coturn",
"vendor": "coturn",
"versions": [
{
"status": "affected",
"version": "\u003c 4.16.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "CWE-400: Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770: Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-11T17:34:51.860Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4"
},
{
"name": "https://github.com/coturn/coturn/pull/2003",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/pull/2003"
},
{
"name": "https://github.com/coturn/coturn/pull/2012",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/pull/2012"
},
{
"name": "https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85"
},
{
"name": "https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09"
},
{
"name": "https://github.com/coturn/coturn/releases/tag/4.16.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/releases/tag/4.16.0"
}
],
"source": {
"advisory": "GHSA-5x2p-4vqj-f6m4",
"discovery": "UNKNOWN"
},
"title": "coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-73214",
"datePublished": "2026-08-11T17:34:51.860Z",
"dateReserved": "2026-08-11T14:41:20.121Z",
"dateUpdated": "2026-08-11T17:34:51.860Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-73214",
"date": "2026-08-12",
"epss": "0.00423",
"percentile": "0.35082"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-73214\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-11T18:18:26.773\",\"lastModified\":\"2026-08-11T18:18:26.773\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"coturn\",\"product\":\"coturn\",\"versions\":[{\"version\":\"\u003c 4.16.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"},{\"lang\":\"en\",\"value\":\"CWE-770\"}]}],\"references\":[{\"url\":\"https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/pull/2003\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/pull/2012\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/releases/tag/4.16.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4\",\"source\":\"security-advisories@github.com\"}]}}",
"redhat_vex": {
"current_release_date": "2026-08-12T09:19:59+00:00",
"cve": "CVE-2026-73214",
"id": "CVE-2026-73214",
"initial_release_date": "2026-08-11T17:34:51.860000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "coturn: coturn: Denial of Service via unverified DTLS session state",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73214.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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