CVE-2021-26857
Vulnerability from cvelistv5
Published
2021-03-02 23:55
Modified
2025-02-04 19:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EPSS score ?
8.92% (0.91771)
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
References
secure@microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857Patch, Vendor Advisory
Impacted products
Vendor Product Version
Microsoft Microsoft Exchange Server 2016 Cumulative Update 19 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 8 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:*:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2013 Cumulative Update 22 Version: 15.00.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 2 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 13 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 Version: 15.00.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 3 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 14 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 4 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 15 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 5 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 6 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 16 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 17 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 7 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 18 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2010 Service Pack 3 Version: 14.0.0.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2010:sp3:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2013 Service Pack 1 Version: 15.00.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_1:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2013 Cumulative Update 21 Version: 15.00.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 12 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 8 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2019 Cumulative Update 1 Version: 15.02.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 9 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 10 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*
 Create a notification for this product.
   Microsoft Microsoft Exchange Server 2016 Cumulative Update 11 Version: 15.01.0   < publication
    cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*
 Create a notification for this product.
CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog

Date added: 2021-11-03

Due date: 2021-04-16

Required action: Apply updates per vendor instructions.

Used in ransomware: Known

Notes: Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-26857

Show details on NVD website

To clipboard 

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         datePublic: "2021-03-02T08:00:00.000Z",
         descriptions: [
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         metrics: [
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                  baseSeverity: "HIGH",
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      cveId: "CVE-2021-26857",
      datePublished: "2021-03-02T23:55:26.000Z",
      dateReserved: "2021-02-08T00:00:00.000Z",
      dateUpdated: "2025-02-04T19:16:52.639Z",
      state: "PUBLISHED",
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   dataType: "CVE_RECORD",
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   "vulnerability-lookup:meta": {
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         cwes: "[\"CWE-502\"]",
         dateAdded: "2021-11-03",
         dueDate: "2021-04-16",
         knownRansomwareCampaignUse: "Known",
         notes: "Reference CISA's ED 21-02 (https://www.cisa.gov/news-events/directives/ed-21-02-mitigate-microsoft-exchange-premises-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-02. https://nvd.nist.gov/vuln/detail/CVE-2021-26857",
         product: "Exchange Server",
         requiredAction: "Apply updates per vendor instructions.",
         shortDescription: "Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.",
         vendorProject: "Microsoft",
         vulnerabilityName: "Microsoft Exchange Server Remote Code Execution Vulnerability",
      },
      nvd: "{\"cve\":{\"id\":\"CVE-2021-26857\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2021-03-03T00:15:12.167\",\"lastModified\":\"2025-03-07T14:57:32.833\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Microsoft Exchange Server Remote Code Execution Vulnerability\"},{\"lang\":\"es\",\"value\":\"Una Vulnerabilidad de Ejecución de código remota de Microsoft Exchange Server. Este ID de CVE es diferente de CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26858, CVE-2021-27065, CVE-2021-27078\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:P/A:P\",\"baseScore\":6.8,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":true}]},\"cisaExploitAdd\":\"2021-11-03\",\"cisaActionDue\":\"2021-04-16\",\"cisaRequiredAction\":\"Apply 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Advisory\"]},{\"url\":\"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Vendor Advisory\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26857\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T20:33:40.973Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-26857\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-04T17:23:38.395840Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-26857\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": 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\"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 8\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2019 Cumulative Update 1\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.02.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange 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         cveMetadata: "{\"cveId\": \"CVE-2021-26857\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-04T19:16:52.639Z\", \"dateReserved\": \"2021-02-08T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-03-02T23:55:26.000Z\", \"assignerShortName\": \"microsoft\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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