CVE-2026-23570 (GCVE-0-2026-23570)
Vulnerability from cvelistv5 – Published: 2026-01-29 08:50 – Updated: 2026-01-29 15:45
VLAI
Title
Log timestamp tampering vulnerability in Content Distribution Service
Summary
A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TeamViewer | DEX |
Affected:
0 , < 26.1
(custom)
|
Credits
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-23570",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-29T15:41:12.827915Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-01-29T15:45:56.209Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"modules": [
"Content Distribution Service",
"NomadBranch.exe"
],
"platforms": [
"Windows"
],
"product": "DEX",
"vendor": "TeamViewer",
"versions": [
{
"lessThan": "26.1",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Threat Hunt Team of Bank of America"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation."
}
],
"value": "A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation."
}
],
"impacts": [
{
"capecId": "CAPEC-93",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-93 Log Injection-Tampering-Forging"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-29T08:50:52.882Z",
"orgId": "13430f76-86eb-43b2-a71c-82c956ef31b6",
"shortName": "TV"
},
"references": [
{
"url": "https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Update the TeamViewer DEX Client (1E Client) to the latest available version."
}
],
"value": "Update the TeamViewer DEX Client (1E Client) to the latest available version."
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Log timestamp tampering vulnerability in Content Distribution Service",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "13430f76-86eb-43b2-a71c-82c956ef31b6",
"assignerShortName": "TV",
"cveId": "CVE-2026-23570",
"datePublished": "2026-01-29T08:50:52.882Z",
"dateReserved": "2026-01-14T13:54:40.322Z",
"dateUpdated": "2026-01-29T15:45:56.209Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-23570",
"date": "2026-06-28",
"epss": "0.00696",
"percentile": "0.48357"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-23570\",\"sourceIdentifier\":\"psirt@teamviewer.com\",\"published\":\"2026-01-29T09:16:04.737\",\"lastModified\":\"2026-06-17T10:21:47.647\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation.\"},{\"lang\":\"es\",\"value\":\"La falta de validaci\u00f3n de un valor controlado por el usuario en el cliente TeamViewer DEX (anteriormente cliente 1E) - Servicio de Distribuci\u00f3n de Contenido (NomadBranch.exe) anterior a la versi\u00f3n 26.1 para Windows permite a un atacante de red adyacente manipular las marcas de tiempo de los registros a trav\u00e9s de un comando UDP Sync manipulado. Esto podr\u00eda resultar en prefijos de fecha y hora falsificados o sin sentido y comprometer la integridad de los registros y la correlaci\u00f3n forense.\"}],\"affected\":[{\"source\":\"psirt@teamviewer.com\",\"affectedData\":[{\"vendor\":\"TeamViewer\",\"product\":\"DEX\",\"defaultStatus\":\"unaffected\",\"modules\":[\"Content Distribution Service\",\"NomadBranch.exe\"],\"platforms\":[\"Windows\"],\"versions\":[{\"version\":\"0\",\"lessThan\":\"26.1\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@teamviewer.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-29T15:41:12.827915Z\",\"id\":\"CVE-2026-23570\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"psirt@teamviewer.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:teamviewer:digital_employee_experience:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"26.1\",\"matchCriteriaId\":\"8E2A5CE4-D147-45E1-8D16-3257B6E79E70\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A2572D17-1DE6-457B-99CC-64AFD54487EA\"}]}]}],\"references\":[{\"url\":\"https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/\",\"source\":\"psirt@teamviewer.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23570\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-29T15:41:12.827915Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-29T15:41:18.715Z\"}}], \"cna\": {\"title\": \"Log timestamp tampering vulnerability in Content Distribution Service\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Threat Hunt Team of Bank of America\"}], \"impacts\": [{\"capecId\": \"CAPEC-93\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-93 Log Injection-Tampering-Forging\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"TeamViewer\", \"modules\": [\"Content Distribution Service\", \"NomadBranch.exe\"], \"product\": \"DEX\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"26.1\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows\"], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Update the TeamViewer DEX Client (1E Client) to the latest available version.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Update the TeamViewer DEX Client (1E Client) to the latest available version.\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001/\"}], \"x_generator\": {\"engine\": \"Vulnogram 0.5.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"13430f76-86eb-43b2-a71c-82c956ef31b6\", \"shortName\": \"TV\", \"dateUpdated\": \"2026-01-29T08:50:52.882Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-23570\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-29T15:45:56.209Z\", \"dateReserved\": \"2026-01-14T13:54:40.322Z\", \"assignerOrgId\": \"13430f76-86eb-43b2-a71c-82c956ef31b6\", \"datePublished\": \"2026-01-29T08:50:52.882Z\", \"assignerShortName\": \"TV\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…