CVE-2021-42785
Vulnerability from cvelistv5
Published
2021-11-23 21:37
Modified
2024-08-04 03:38
Severity ?
Summary
Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.
References
cve_disclosure@tech.gov.sghttps://www.tightvnc.com/whatsnew.phpRelease Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.tightvnc.com/whatsnew.phpRelease Notes, Vendor Advisory
Impacted products
Vendor Product Version
GlavSoft LLC TightVNC Viewer Version: 2.8.59   <
Create a notification for this product.
Show details on NVD website

To clipboard 

{
   containers: {
      adp: [
         {
            providerMetadata: {
               dateUpdated: "2024-08-04T03:38:50.226Z",
               orgId: "af854a3a-2127-422b-91ae-364da2661108",
               shortName: "CVE",
            },
            references: [
               {
                  tags: [
                     "x_refsource_MISC",
                     "x_transferred",
                  ],
                  url: "https://www.tightvnc.com/whatsnew.php",
               },
            ],
            title: "CVE Program Container",
         },
      ],
      cna: {
         affected: [
            {
               product: "TightVNC Viewer",
               vendor: "GlavSoft LLC",
               versions: [
                  {
                     lessThanOrEqual: "2.8.59",
                     status: "affected",
                     version: "2.8.59",
                     versionType: "custom",
                  },
               ],
            },
         ],
         credits: [
            {
               lang: "en",
               value: "Eugene Lim from Government Technology Agency of Singapore",
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.",
            },
         ],
         problemTypes: [
            {
               descriptions: [
                  {
                     cweId: "CWE-120",
                     description: "CWE-120 Buffer Overflow",
                     lang: "en",
                     type: "CWE",
                  },
               ],
            },
         ],
         providerMetadata: {
            dateUpdated: "2021-11-23T21:37:07",
            orgId: "1a37b84a-8e51-4525-b3d6-87e2fae01dbd",
            shortName: "GovTech CSG",
         },
         references: [
            {
               tags: [
                  "x_refsource_MISC",
               ],
               url: "https://www.tightvnc.com/whatsnew.php",
            },
         ],
         source: {
            discovery: "EXTERNAL",
         },
         title: "Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59",
         x_generator: {
            engine: "Vulnogram 0.0.9",
         },
         x_legacyV4Record: {
            CVE_data_meta: {
               ASSIGNER: "cve_disclosure@tech.gov.sg",
               ID: "CVE-2021-42785",
               STATE: "PUBLIC",
               TITLE: "Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59",
            },
            affects: {
               vendor: {
                  vendor_data: [
                     {
                        product: {
                           product_data: [
                              {
                                 product_name: "TightVNC Viewer",
                                 version: {
                                    version_data: [
                                       {
                                          version_affected: "<=",
                                          version_name: "2.8.59",
                                          version_value: "2.8.59",
                                       },
                                    ],
                                 },
                              },
                           ],
                        },
                        vendor_name: "GlavSoft LLC",
                     },
                  ],
               },
            },
            credit: [
               {
                  lang: "eng",
                  value: "Eugene Lim from Government Technology Agency of Singapore",
               },
            ],
            data_format: "MITRE",
            data_type: "CVE",
            data_version: "4.0",
            description: {
               description_data: [
                  {
                     lang: "eng",
                     value: "Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.",
                  },
               ],
            },
            generator: {
               engine: "Vulnogram 0.0.9",
            },
            problemtype: {
               problemtype_data: [
                  {
                     description: [
                        {
                           lang: "eng",
                           value: "CWE-120 Buffer Overflow",
                        },
                     ],
                  },
               ],
            },
            references: {
               reference_data: [
                  {
                     name: "https://www.tightvnc.com/whatsnew.php",
                     refsource: "MISC",
                     url: "https://www.tightvnc.com/whatsnew.php",
                  },
               ],
            },
            source: {
               discovery: "EXTERNAL",
            },
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "1a37b84a-8e51-4525-b3d6-87e2fae01dbd",
      assignerShortName: "GovTech CSG",
      cveId: "CVE-2021-42785",
      datePublished: "2021-11-23T21:37:07",
      dateReserved: "2021-10-21T00:00:00",
      dateUpdated: "2024-08-04T03:38:50.226Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      fkie_nvd: {
         configurations: "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:*\", \"versionEndIncluding\": \"2.8.59\", \"matchCriteriaId\": \"E9227D38-8A36-4104-8703-77E0B93E1E43\"}]}]}]",
         descriptions: "[{\"lang\": \"en\", \"value\": \"Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.\"}, {\"lang\": \"es\", \"value\": \"Una vulnerabilidad de desbordamiento del b\\u00fafer en el archivo tvnviewer.exe de TightVNC Viewer permite a un atacante remoto ejecutar instrucciones arbitrarias por medio de un paquete FramebufferUpdate dise\\u00f1ado desde un servidor VNC\"}]",
         id: "CVE-2021-42785",
         lastModified: "2024-11-21T06:28:10.337",
         metrics: "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 5.9}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:P/I:P/A:P\", \"baseScore\": 7.5, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"HIGH\", \"exploitabilityScore\": 10.0, \"impactScore\": 6.4, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
         published: "2021-11-23T22:15:08.133",
         references: "[{\"url\": \"https://www.tightvnc.com/whatsnew.php\", \"source\": \"cve_disclosure@tech.gov.sg\", \"tags\": [\"Release Notes\", \"Vendor Advisory\"]}, {\"url\": \"https://www.tightvnc.com/whatsnew.php\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Release Notes\", \"Vendor Advisory\"]}]",
         sourceIdentifier: "cve_disclosure@tech.gov.sg",
         vulnStatus: "Modified",
         weaknesses: "[{\"source\": \"cve_disclosure@tech.gov.sg\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-120\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-120\"}]}]",
      },
      nvd: "{\"cve\":{\"id\":\"CVE-2021-42785\",\"sourceIdentifier\":\"cve_disclosure@tech.gov.sg\",\"published\":\"2021-11-23T22:15:08.133\",\"lastModified\":\"2024-11-21T06:28:10.337\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de desbordamiento del búfer en el archivo tvnviewer.exe de TightVNC Viewer permite a un atacante remoto ejecutar instrucciones arbitrarias por medio de un paquete FramebufferUpdate diseñado desde un servidor VNC\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:P/A:P\",\"baseScore\":7.5,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"cve_disclosure@tech.gov.sg\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-120\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-120\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"2.8.59\",\"matchCriteriaId\":\"E9227D38-8A36-4104-8703-77E0B93E1E43\"}]}]}],\"references\":[{\"url\":\"https://www.tightvnc.com/whatsnew.php\",\"source\":\"cve_disclosure@tech.gov.sg\",\"tags\":[\"Release Notes\",\"Vendor Advisory\"]},{\"url\":\"https://www.tightvnc.com/whatsnew.php\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Vendor Advisory\"]}]}}",
   },
}


Log in or create an account to share your comment.

Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.