PULSEUnderground Intel

LIVE16signals / 24h

FEED

ransomemperador reclama a MPI LTDA · BR · Otherransomspacebears reclama a Alma Center Servizi Medicali S.r.l. · IT · Healthcareransomspacebears reclama a Holistic Health Group, Inc. (d/b/a Suncrafted) · US · Healthcareransomn0n reclama a Company #69 · Not Foundransomiah6477 reclama a alera · Professional Servicesransomn0n reclama a Company #68 · US · Not Foundransomn0n reclama a Company #67 · NL · Not Foundransomn0n reclama a Company #66 · Not Foundransomn0n reclama a Interior Technologies · Technologyransomeclipse reclama a Taiwan Otsuka Pharmaceutical · TW · Healthcareransomeclipse reclama a japantimes.co.jp · JP · Otherransomakira reclama a FOODMatch · Agriculture and Food Productionransomakira reclama a Shediac Lobster Shop · CA · Retail & E-Commerceransomakira reclama a Torns Enterprises · Not Foundransomemperador reclama a MPI LTDA · BR · Otherransomspacebears reclama a Alma Center Servizi Medicali S.r.l. · IT · Healthcareransomspacebears reclama a Holistic Health Group, Inc. (d/b/a Suncrafted) · US · Healthcareransomn0n reclama a Company #69 · Not Foundransomiah6477 reclama a alera · Professional Servicesransomn0n reclama a Company #68 · US · Not Foundransomn0n reclama a Company #67 · NL · Not Foundransomn0n reclama a Company #66 · Not Foundransomn0n reclama a Interior Technologies · Technologyransomeclipse reclama a Taiwan Otsuka Pharmaceutical · TW · Healthcareransomeclipse reclama a japantimes.co.jp · JP · Otherransomakira reclama a FOODMatch · Agriculture and Food Productionransomakira reclama a Shediac Lobster Shop · CA · Retail & E-Commerceransomakira reclama a Torns Enterprises · Not Found

CVE Watch—

CVE-2021-31207

Microsoft Exchange Server Security Feature Bypass Vulnerability

CVSS

—

No CVSS

EPSS

99.8%

p100

KEV

YES

Nov 3, 2021

Exploit Today

80

0-100

Published: — · Last modified: —

EPSS · 30d

99.8%EPSS · 30 days99.8%

2026-09-162026-10-14

KEV catalog record

Product

Microsoft / Exchange Server

Vulnerability

Microsoft Exchange Server Security Feature Bypass Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

Nov 17, 2021

Known ransomware use

Yes

Summary description

Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-31207

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CVECVSSEPSSKEVRExploitTitleMod.

CVE-2023-215298.8 HIG

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KEV—80Microsoft Exchange Server Privilege Escalation Vulnerability66d CVE-2021-345239.0 CRI

KEV—80Microsoft Exchange Server Privilege Escalation Vulnerability66d CVE-2021-344739.1 CRI

KEV—80Microsoft Exchange Server Remote Code Execution Vulnerability66d CVE-2021-337667.3 HIG

KEV—80Microsoft Exchange Server Information Disclosure66d CVE-2021-311967.2 HIG

KEV—80Microsoft Exchange Server Information Disclosure Vulnerability66d