CVE-2021-344739.1CriticalCWE-918

CVE-2021-34473: Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft · Microsoft Exchange Server 2013 Cumulative Update 23

Vendor fix available · Affected: Microsoft Exchange Server 2013 Cumulative Update 23 · Exploitation: in CISA KEV since 3 Nov 2021

Known ransomware use

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

ExploitationIn CISA KEV

In CISA KEVCISA KEV catalogue3 Nov 2021
Exploited (reported): not seen
Scanning observed: not seen
Proof of concept public: not seen
Not established: not seen

99.9%probability of exploitation in the next 30 days

99th percentile

050100

Higher than 99% of scored CVEs

9.1CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected products5

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Microsoft · Microsoft Exchange Server 2013 Cumulative Update 23from 15.00.0 before 15.00.1497.015
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 19from 15.01.0 before 15.01.2176.012
Microsoft · Microsoft Exchange Server 2016 Cumulative Update 20from 15.01.0 before 15.01.2242.008
Microsoft · Microsoft Exchange Server 2019 Cumulative Update 8from 15.02.0 before 15.02.0792.013
Microsoft · Microsoft Exchange Server 2019 Cumulative Update 9from 15.02.0 before 15.02.0858.010

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalogue.
CISA KEV: Listed since 3 Nov 2021 · known ransomware use · catalogue entry
Public check: Exchange Server - Remote Code Execution · nuclei template in projectdiscovery/nuclei-templates
Weakness: Server-Side Request Forgery
Vendor: Microsoft
Published: July 2021
Band: Exploited in the wild, July 2021

What changed

5 Nov
CISA’s KEV entry now notes known ransomware use CISA
3 Nov 2021
CISA added it to the KEV catalogue CISA

CoverageNo articles yet

No CyberSIXT article names CVE-2021-34473 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.