CVE-2021-34453

published 2021-10-13

CVE-2021-34453: Microsoft Exchange Server Denial of Service Vulnerability

Priority P3 36 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

Microsoft Exchange Server Denial of Service Vulnerability

Affected

10 ranges

Vendor	Product	Version range	Fixed in
microsoft	exchange_server	—	—
microsoft	exchange_server	—	—
microsoft	microsoft_exchange_server_2016_cumulative_update_21	>= 15.01.0 < 15.01.2308.015	15.01.2308.015
microsoft	microsoft_exchange_server_2016_cumulative_update_22	>= 15.0.0 < 15.01.2375.012	15.01.2375.012
microsoft	microsoft_exchange_server_2019_cumulative_update_10	>= 15.02.0 < 15.02.0922.014	15.02.0922.014
microsoft	microsoft_exchange_server_2019_cumulative_update_11	>= 15.02.0 < 15.02.0986.009	15.02.0986.009
msrc	microsoft_exchange_server_2016_cumulative_update_21	—	—
msrc	microsoft_exchange_server_2016_cumulative_update_22	—	—
msrc	microsoft_exchange_server_2019_cumulative_update_10	—	—
msrc	microsoft_exchange_server_2019_cumulative_update_11	—	—

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v2.0 5.0 MEDIUM AV:N/AC:L/Au:N/C:N/I:N/A:P

vendor_msrc 7.5 HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.