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vuln-cve/data/2021/21xxx/CVE-2021-21404.json
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{
"containers": {
"cna": {
"affected": [
{
"product": "syncthing",
"vendor": "syncthing",
"versions": [
{
"status": "affected",
"version": "< 1.15.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-04-06T20:00:15.000Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://pkg.go.dev/github.com/syncthing/syncthing"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/syncthing/syncthing/releases/tag/v1.15.0"
}
],
"source": {
"advisory": "GHSA-x462-89pf-6r5h",
"discovery": "UNKNOWN"
},
"title": "Crash due to malformed relay protocol message",
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "security-advisories@github.com",
"ID": "CVE-2021-21404",
"STATE": "PUBLIC",
"TITLE": "Crash due to malformed relay protocol message"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "syncthing",
"version": {
"version_data": [
{
"version_value": "< 1.15.0"
}
]
}
}
]
},
"vendor_name": "syncthing"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative length field. Similarly, Syncthing itself can crash for the same reason if given a malformed message from a malicious relay server when attempting to join the relay. Relay joins are essentially random (from a subset of low latency relays) and Syncthing will by default restart when crashing, at which point it's likely to pick another non-malicious relay. This flaw is fixed in version 1.15.0."
}
]
},
"impact": {
"cvss": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-20 Improper Input Validation"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h",
"refsource": "CONFIRM",
"url": "https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"
},
{
"name": "https://pkg.go.dev/github.com/syncthing/syncthing",
"refsource": "MISC",
"url": "https://pkg.go.dev/github.com/syncthing/syncthing"
},
{
"name": "https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97",
"refsource": "MISC",
"url": "https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"
},
{
"name": "https://github.com/syncthing/syncthing/releases/tag/v1.15.0",
"refsource": "MISC",
"url": "https://github.com/syncthing/syncthing/releases/tag/v1.15.0"
}
]
},
"source": {
"advisory": "GHSA-x462-89pf-6r5h",
"discovery": "UNKNOWN"
}
}
},
"adp": [
{
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2024-08-03T18:09:16.158Z"
},
"title": "CVE Program Container",
"references": [
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://github.com/syncthing/syncthing/security/advisories/GHSA-x462-89pf-6r5h"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://pkg.go.dev/github.com/syncthing/syncthing"
},
{
"tags": [
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"x_transferred"
],
"url": "https://github.com/syncthing/syncthing/commit/fb4fdaf4c0a79c22cad000c42ac1394e3ccb6a97"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/syncthing/syncthing/releases/tag/v1.15.0"
}
]
}
]
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2021-21404",
"datePublished": "2021-04-06T20:00:15.000Z",
"dateReserved": "2020-12-22T00:00:00.000Z",
"dateUpdated": "2024-08-03T18:09:16.158Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
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