{"cvss":9.1,"datePublished":"2021-11-03","dateUpdated":"2021-11-03","description":"Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.","dueDate":"2022-05-03","id":"CVE-2021-26855","kev_catalogs":["cisa"],"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.","severity":"CRITICAL","source":"cisa_known_exploited","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","vendor":"Microsoft"}