CVE-2019-18988 (GCVE-0-2019-18988)

Vulnerability from cvelistv5 – Published: 2020-02-07 15:09 – Updated: 2025-10-21 23:35
VLAI? CISA KEV
Summary
TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control because the same key is used for different customers' installations. It used a shared AES key for all installations since at least as far back as v7.0.43148, and used it for at least OptionsPasswordAES in the current version of the product. If an attacker were to know this key, they could decrypt protect information stored in the registry or configuration files of TeamViewer. With versions before v9.x , this allowed for attackers to decrypt the Unattended Access password to the system (which allows for remote login to the system as well as headless file browsing). The latest version still uses the same key for OptionPasswordAES but appears to have changed how the Unattended Access password is stored. While in most cases an attacker requires an existing session on a system, if the registry/configuration keys were stored off of the machine (such as in a file share or online), an attacker could then decrypt the required password to login to the system.
Severity ?
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4a4ef3e6-e5ae-467f-a167-fae56512c3f3

Vulnerability ID: CVE-2019-18988

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: TeamViewer Desktop Bypass Remote Login Vulnerability | Affected: TeamViewer / Desktop | Description: TeamViewer Desktop allows for bypass of remote-login access control because the same AES key is used for different customers' installations. If an attacker were to know this key, they could decrypt protected information stored in registry or configuration files or decryption of the Unattended Access password to the system (which allows for remote login to the system). | Required action: Apply updates per vendor instructions. | Due date: 2022-05-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2019-18988
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-521
Feed CISA Known Exploited Vulnerabilities Catalog
Product Desktop
Due Date 2022-05-03
Date Added 2021-11-03
Vendorproject TeamViewer
Vulnerabilityname TeamViewer Desktop Bypass Remote Login Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:29 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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Mientras que en la mayor\u00eda de los casos un atacante requiere una sesi\u00f3n existente en un sistema, si las claves de registro/configuraci\u00f3n fueron almacenadas fuera de la m\u00e1quina (como en un recurso compartido de archivos o en l\u00ednea), un atacante podr\u00eda descifrar la contrase\u00f1a requerida para iniciar sesi\u00f3n en el sistema .\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:L/AC:M/Au:N/C:P/I:P/A:P\",\"baseScore\":4.4,\"accessVector\":\"LOCAL\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":3.4,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"cisaExploitAdd\":\"2021-11-03\",\"cisaActionDue\":\"2022-05-03\",\"cisaRequiredAction\":\"Apply updates per vendor instructions.\",\"cisaVulnerabilityName\":\"TeamViewer Desktop Bypass Remote Login Vulnerability\",\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-521\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-521\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:teamviewer:teamviewer:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"14.7.1965\",\"matchCriteriaId\":\"1169616E-3D16-4688-8402-8E922F26B339\"}]}]}],\"references\":[{\"url\":\"https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264\",\"source\":\"cve@mitre.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label\u0026labels=Security\",\"source\":\"cve@mitre.org\",\"tags\":[\"Broken Link\",\"Vendor Advisory\"]},{\"url\":\"https://twitter.com/Blurbdust/status/1224212682594770946?s=20\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://whynotsecurity.com/blog/teamviewer/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label\u0026labels=Security\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Broken Link\",\"Vendor Advisory\"]},{\"url\":\"https://twitter.com/Blurbdust/status/1224212682594770946?s=20\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://whynotsecurity.com/blog/teamviewer/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18988\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"tags\":[\"US Government Resource\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label\u0026labels=Security\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://whynotsecurity.com/blog/teamviewer/\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://twitter.com/Blurbdust/status/1224212682594770946?s=20\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-05T02:02:39.860Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.0, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2019-18988\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-04T20:33:26.822954Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18988\"}}}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2021-11-03T00:00:00+00:00\", \"value\": \"CVE-2019-18988 added to CISA KEV\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-521\", \"description\": \"CWE-521 Weak Password Requirements\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-04T20:33:19.805Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"references\": [{\"url\": \"https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label\u0026labels=Security\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://whynotsecurity.com/blog/teamviewer/\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://twitter.com/Blurbdust/status/1224212682594770946?s=20\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control because the same key is used for different customers\u0027 installations. 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      "cveMetadata": "{\"cveId\": \"CVE-2019-18988\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-07-30T01:45:49.231Z\", \"dateReserved\": \"2019-11-15T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2020-02-07T15:09:36.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.