by Kastro
Paper/Archive/CVE-2021-34523

CVE-2021-34523

Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 — Microsoft Exchange Server Elevation of Privilege Vulnerability

KEV · due 17 Novransomware useEPSS 100%public exploitSSVC actCVSS 9.0
critical.is priorityof 100
97
CVSS 9.0 (CNA)9.0 / 10 × 3027.0In CISA KEV+3030.0EPSS percentile 100.01.000 × 2020.0Exploit: SSVC active+1010.0SSVC exploitation: active+1010.0
Description · from the CVE record

Microsoft Exchange Server Elevation of Privilege Vulnerability

Affected

ProductAffectedFixed inSource
Microsoft Exchange Server 2013 Cumulative Update 2315.00.0 – < 15.00.1497.01515.00.1497.015CNA
Microsoft Exchange Server 2016 Cumulative Update 1915.01.0 – < 15.01.2176.01215.01.2176.012CNA
Microsoft Exchange Server 2016 Cumulative Update 2015.01.0 – < 15.01.2242.00815.01.2242.008CNA
Microsoft Exchange Server 2019 Cumulative Update 815.02.0 – < 15.02.0792.01315.02.0792.013CNA
Microsoft Exchange Server 2019 Cumulative Update 915.02.0 – < 15.02.0858.01015.02.0858.010CNA

Scores by source

microsoft (CNA)9.0CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: active · Automatable: no · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2021-34523refportal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34523refzerodayinitiative.com/advisories/ZDI-21-822refpacketstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.htmlrefcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34523kevcisa.gov/known-exploited-vulnerabilities-catalog