CVE-2021-26855
Vulnerability from cvelistv5
Published
2021-03-02 23:55
Modified
2025-02-04 19:17
Severity ?
EPSS score ?
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
References
Impacted products
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| ▼ | Microsoft | Microsoft Exchange Server 2016 Cumulative Update 19 |
Version: 15.01.0 < publication cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:* |
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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-2021-26855
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other: { content: { id: "CVE-2021-26855", options: [ { Exploitation: "active", }, { Automatable: "yes", }, { "Technical Impact": "total", }, ], role: "CISA Coordinator", timestamp: "2024-01-02T18:10:15.970217Z", version: "2.0.3", }, type: "ssvc", }, }, { other: { content: { dateAdded: "2021-11-03", reference: "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-26855", }, type: "kev", }, }, ], problemTypes: [ { descriptions: [ { cweId: "CWE-918", description: "CWE-918 Server-Side Request Forgery (SSRF)", lang: "en", type: "CWE", }, ], }, ], providerMetadata: { dateUpdated: "2025-02-04T19:17:24.302Z", orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0", shortName: "CISA-ADP", }, title: "CISA ADP Vulnrichment", }, ], cna: { affected: [ { cpes: [ "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*", ], platforms: [ "x64-based Systems", ], product: "Microsoft Exchange Server 2016 Cumulative Update 19", vendor: "Microsoft", versions: [ 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value: "GENERAL", }, ], }, ], problemTypes: [ { descriptions: [ { description: "Remote Code Execution", lang: "en-US", type: "Impact", }, ], }, ], providerMetadata: { dateUpdated: "2023-12-29T20:08:56.682Z", orgId: "f38d906d-7342-40ea-92c1-6c4a2c6478c8", shortName: "microsoft", }, references: [ { tags: [ "x_refsource_MISC", ], url: "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855", }, { tags: [ "x_refsource_MISC", ], url: "http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html", }, { tags: [ "x_refsource_MISC", ], url: "http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html", }, { tags: [ "x_refsource_MISC", ], url: "http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html", }, { tags: [ "x_refsource_MISC", ], url: "http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html", }, ], title: "Microsoft Exchange Server Remote Code Execution Vulnerability", }, }, cveMetadata: { assignerOrgId: "f38d906d-7342-40ea-92c1-6c4a2c6478c8", assignerShortName: "microsoft", cveId: "CVE-2021-26855", datePublished: "2021-03-02T23:55:26.000Z", dateReserved: "2021-02-08T00:00:00.000Z", dateUpdated: "2025-02-04T19:17:24.302Z", state: "PUBLISHED", }, dataType: "CVE_RECORD", dataVersion: "5.1", "vulnerability-lookup:meta": { cisa_known_exploited: { cveID: "CVE-2021-26855", cwes: "[\"CWE-918\"]", 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-2021-26855", 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-2021-26855\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2021-03-03T00:15:12.103\",\"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-2021-26857, CVE-2021-26858, CVE-2021-27065, 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[{\"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 Server 2016 Cumulative Update 9\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 10\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 11\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}], \"datePublic\": \"2021-03-02T08:00:00.000Z\", \"references\": [{\"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Microsoft Exchange Server Remote Code Execution Vulnerability\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"Impact\", \"description\": \"Remote Code Execution\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2023-12-29T20:08:56.682Z\"}}}", cveMetadata: "{\"cveId\": \"CVE-2021-26855\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-04T19:17:24.302Z\", \"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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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.