CVE-2021-26858 (GCVE-0-2021-26858)
Vulnerability from cvelistv5
Published
2021-03-02 23:55
Modified
2025-10-21 23:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Remote Code Execution
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
References
| ► | URL | Tags |
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Impacted products
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| ► | Microsoft | Microsoft Exchange Server 2019 |
Version: 15.02.0 < publication cpe:2.3:a:microsoft:exchange_server:2019:*:*:*:*:*:*:* |
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CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog
Date added: 2021-11-03
Due date: 2022-05-03
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-2021-26858
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\"versionType\": \"custom\", \"status\": \"affected\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 8\", \"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*\"], \"platforms\": [\"x64-based Systems\"], \"versions\": [{\"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\", \"status\": \"affected\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2019 Cumulative Update 1\", \"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*\"], \"platforms\": [\"x64-based Systems\"], \"versions\": [{\"version\": \"15.02.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\", \"status\": \"affected\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 9\", \"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*\"], \"platforms\": [\"x64-based Systems\"], \"versions\": [{\"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\", \"status\": \"affected\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 10\", \"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*\"], \"platforms\": [\"x64-based Systems\"], \"versions\": [{\"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\", \"status\": \"affected\"}]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 11\", \"cpes\": [\"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*\"], \"platforms\": [\"x64-based Systems\"], \"versions\": [{\"version\": \"15.01.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\", \"status\": \"affected\"}]}], \"descriptions\": [{\"value\": \"Microsoft Exchange Server Remote Code Execution Vulnerability\", \"lang\": \"en-US\"}], \"problemTypes\": [{\"descriptions\": [{\"description\": \"Remote Code Execution\", \"lang\": \"en-US\", \"type\": \"Impact\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2023-12-29T20:08:57.719Z\"}, \"references\": [{\"tags\": [\"x_refsource_MISC\"], \"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858\"}], \"metrics\": [{\"format\": \"CVSS\", \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}], \"cvssV3_1\": {\"version\": \"3.1\", \"baseSeverity\": \"HIGH\", \"baseScore\": 7.8, \"vectorString\": \"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\"}}]}, \"adp\": [{\"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T20:33:41.156Z\"}, \"title\": \"CVE Program Container\", \"references\": [{\"tags\": [\"x_refsource_MISC\", \"x_transferred\"], \"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858\"}]}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-26858\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-04T19:16:00.589195Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26858\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26858\", \"tags\": [\"government-resource\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-04T19:16:27.554Z\"}, \"timeline\": [{\"time\": \"2021-11-03T00:00:00+00:00\", \"lang\": \"en\", \"value\": \"CVE-2021-26858 added to CISA KEV\"}], \"title\": \"CISA ADP Vulnrichment\"}]}",
"cveMetadata": "{\"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"assignerShortName\": \"microsoft\", \"cveId\": \"CVE-2021-26858\", \"datePublished\": \"2021-03-02T23:55:27.000Z\", \"dateReserved\": \"2021-02-08T00:00:00.000Z\", \"dateUpdated\": \"2025-10-21T23:25:52.837Z\", \"state\": \"PUBLISHED\"}",
"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.
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