{"id":"CVE-2023-21707","published":"2023-02-14T19:32:45Z","modified":"2026-08-19T16:26:37Z","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","vendor":"Microsoft","product":"Microsoft Exchange Server 2013 Cumulative Update 23","tier":"core","eol":null,"affectedVersions":[{"vendor":"Microsoft","product":"Microsoft Exchange Server 2013 Cumulative Update 23","versions":[">= 15.00.0, < 15.00.1497.048"]},{"vendor":"Microsoft","product":"Microsoft Exchange Server 2016 Cumulative Update 23","versions":[">= 15.01.0, < 15.01.2507.023"]},{"vendor":"Microsoft","product":"Microsoft Exchange Server 2019 Cumulative Update 11","versions":[">= 15.02.0, < 15.02.0986.042"]},{"vendor":"Microsoft","product":"Microsoft Exchange Server 2019 Cumulative Update 12","versions":[">= 15.02.0, < 15.02.1118.026"]}],"description":{"text":"Microsoft Exchange Server Remote Code Execution Vulnerability","provenance":"source","from":"CVE.org"},"summary":{"text":"Microsoft Exchange Server 2013 Cumulative Update 23 contains a remote code execution flaw involving deserialization of untrusted data. An attacker with network access and low-privilege authentication, requiring no user interaction, could exploit this flaw to execute arbitrary code.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:12:18Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.8202,"percentile":0.99651,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":1,"pulses":[{"name":"ACTUALIZACION | Guía de actualización de seguridad MICROSOFT","url":"https://otx.alienvault.com/pulse/63ee3a204e550153f8eb051b","created":"2023-02-16"}],"provenance":"machine"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21707","tags":["vendor-advisory","patch"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2023-25874","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-25874","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2023-06-30","earliestUrl":"https://github.com/N1k0la-T/CVE-2023-21707","repos":[{"name":"N1k0la-T/CVE-2023-21707","url":"https://github.com/N1k0la-T/CVE-2023-21707","stars":28,"created":"2023-06-30"}]},"first":{"date":"2023-06-30","source":"PoC-in-GitHub","url":"https://github.com/N1k0la-T/CVE-2023-21707"},"provenance":"source"},"exploitRefs":[],"flow":[],"timeline":[{"date":"2023-02-14","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2023-21707","provenance":"source"},{"date":"2023-06-30","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/N1k0la-T/CVE-2023-21707","provenance":"source"}],"speed":{"daysToPublicExploit":136,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":31.8,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.93,"detail":"percentile 0.9965"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":0.68,"detail":"1 pulse"},{"name":"CVSS severity","points":6.16,"detail":"base score 8.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-microsoft-exchange-server-cwe-502"}}