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Early exploitation intelligence

Known Exploited Vulnerabilities Feed

Browse early exploitation warnings with confidence scoring, proprietary sensor telemetry where available, CISA KEV status, and practical detection artifacts for vulnerability management, CTI, SOC, and MSSP workflows.

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Total KEVs
2,773
Known exploited vulnerabilities tracked by Previdian
Beyond CISA KEV
1,097
Additional exploited vulnerabilities beyond the official catalog
Observed in Sensors
132
Tracked KEVs with sensor activity in the last 7 days
Artifacts Available
1,744+
PoC, Nuclei, Metasploit, and virtual patch context

Explore the Previdian Feed

Filter known exploited vulnerabilities by evidence confidence, CISA status, sensor activity, recency, vendor, and available artifacts.

All KEVs 2,773 Beyond CISA 1,097 Observed 132 High confidence With artifacts 1,744+
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Displaying vulnerabilities 826 - 850 of 1744 in total

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CVE-2021-1675

Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2020-1054

Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1709, Windows 10 Version 1709 for 32-bit Systems, Windows 10 Version 1803, Windows 10 Version 1809, Windows 10 Version 1903 for 32-bit Systems, Windows 10 Version 1903 for ARM64-based Systems, Windows 10 Version 1903 for x64-based Systems, Windows 10 Version 1909, Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server, version 1803 (Server Core Installation), Windows Server, version 1903 (Server Core installation), Windows Server, version 1909 (Server Core installation)

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-27065

Microsoft Exchange Server 2013 Cumulative Update 21, Microsoft Exchange Server 2013 Cumulative Update 22, Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2013 Service Pack 1, Microsoft Exchange Server 2016 Cumulative Update 10, Microsoft Exchange Server 2016 Cumulative Update 11, Microsoft Exchange Server 2016 Cumulative Update 12, Microsoft Exchange Server 2016 Cumulative Update 13, Microsoft Exchange Server 2016 Cumulative Update 14, Microsoft Exchange Server 2016 Cumulative Update 15, Microsoft Exchange Server 2016 Cumulative Update 16, Microsoft Exchange Server 2016 Cumulative Update 17, Microsoft Exchange Server 2016 Cumulative Update 18, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2016 Cumulative Update 8, Microsoft Exchange Server 2016 Cumulative Update 9, Microsoft Exchange Server 2019, Microsoft Exchange Server 2019 Cumulative Update 1, Microsoft Exchange Server 2019 Cumulative Update 2, Microsoft Exchange Server 2019 Cumulative Update 3, Microsoft Exchange Server 2019 Cumulative Update 4, Microsoft Exchange Server 2019 Cumulative Update 5, Microsoft Exchange Server 2019 Cumulative Update 6, Microsoft Exchange Server 2019 Cumulative Update 7, Microsoft Exchange Server 2019 Cumulative Update 8

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-26855

Microsoft Exchange Server 2013 Cumulative Update 21, Microsoft Exchange Server 2013 Cumulative Update 22, Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 10, Microsoft Exchange Server 2016 Cumulative Update 11, Microsoft Exchange Server 2016 Cumulative Update 12, Microsoft Exchange Server 2016 Cumulative Update 13, Microsoft Exchange Server 2016 Cumulative Update 14, Microsoft Exchange Server 2016 Cumulative Update 15, Microsoft Exchange Server 2016 Cumulative Update 16, Microsoft Exchange Server 2016 Cumulative Update 17, Microsoft Exchange Server 2016 Cumulative Update 18, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2016 Cumulative Update 8, Microsoft Exchange Server 2016 Cumulative Update 9, Microsoft Exchange Server 2019, Microsoft Exchange Server 2019 Cumulative Update 1, Microsoft Exchange Server 2019 Cumulative Update 2, Microsoft Exchange Server 2019 Cumulative Update 3, Microsoft Exchange Server 2019 Cumulative Update 4, Microsoft Exchange Server 2019 Cumulative Update 5, Microsoft Exchange Server 2019 Cumulative Update 6, Microsoft Exchange Server 2019 Cumulative Update 7, Microsoft Exchange Server 2019 Cumulative Update 8

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2021-40444

Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 1909, Windows 10 Version 2004, Windows 10 Version 20H2, Windows 10 Version 21H1, Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server version 2004, Windows Server version 20H2

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-31207

Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 9, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2019 Cumulative Update 8

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-34527

Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 20H2, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 21H2, Windows 11 version 22H2, Windows 8.1, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server version 20H2

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nessus
CVE-2021-1732

Windows 10 Version 1803, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows Server, version 1909 (Server Core installation), Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-34473

Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2019 Cumulative Update 8, Microsoft Exchange Server 2019 Cumulative Update 9

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2019-0708

Windows, Windows Server

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2020-0688

Microsoft Exchange Server 2013, Microsoft Exchange Server 2019 Cumulative Update 3, Microsoft Exchange Server 2016 Cumulative Update 14, Microsoft Exchange Server 2016 Cumulative Update 15, Microsoft Exchange Server 2019 Cumulative Update 4, Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2017-7269

Internet Information Services (IIS)

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2021-34523

Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2019 Cumulative Update 8, Microsoft Exchange Server 2019 Cumulative Update 9

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
—
CVE-2021-31956

Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-31955

Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC
CVE-2021-38647

Azure Automation State Configuration, DSC Extension, Azure Automation Update Management, Azure Diagnostics (LAD), Azure Security Center, Azure Sentinel, Azure Stack Hub, Container Monitoring Solution, Log Analytics Agent, Open Management Infrastructure, System Center Operations Manager (SCOM)

Microsoft
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2021-22502

Operation Bridge Reporter.

Micro Focus
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2020-7961

Liferay Portal

Liferay
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2021-30116

VSA

Kaseya
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2020-15505

Core & Connector, Sentry, Monitor and Reporting Database (RDB)

MobileIron
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei
CVE-2019-4716

Planning Analytics

IBM
Confirmed
CISA
In catalog
Sensors
—
Added
over 1 year ago
Artifacts
PoC Nuclei

What Are Known Exploited Vulnerabilities?

Known exploited vulnerabilities are vulnerabilities with credible evidence of real-world exploitation. They help security teams move beyond severity-only prioritization and focus remediation on vulnerabilities attackers are actually using.

For a deeper definition, see What Is a Known Exploited Vulnerability?.

Sensor-Led Early Warning

Previdian uses proprietary sensors and private honeypots to observe exploitation attempts, corroborates those signals with vendor advisories and relevant public evidence, and keeps CISA KEV status as context.

Compare with CISA KEV →

Evidence You Can Act On

Each warning can include confidence, evidence links, exploitation status, EPSS, CVSS, CWE, proof-of-concept references, scanner templates, and sensor telemetry where available.

Read the methodology →

Consume the Data in Your Workflow

Browse the live feed, subscribe via RSS, pull the free JSON feed, or use the Pro API for deeper evidence, available telemetry summaries, virtual patches, and integration-ready delivery.

RSS feed JSON feed API integrations

Known Exploited Vulnerability Feed FAQ

How Previdian observes, validates, and delivers early exploitation warnings.

What is a known exploited vulnerability?

A known exploited vulnerability is a CVE with credible evidence that attackers have exploited it in real-world conditions, rather than a vulnerability assessed only through theoretical severity. See also What Is a Known Exploited Vulnerability?.

How does Previdian differ from the CISA KEV Catalog?

CISA KEV is the baseline. Previdian complements it with proprietary sensor and honeypot observations, then corroborates warnings with vendor advisories and relevant public evidence — with confidence and inspectable provenance attached. Browse known exploited vulnerabilities not in CISA KEV or compare with CISA KEV.

What does observed in sensors mean?

It means Previdian honeypots recorded activity associated with exploitation attempts for that vulnerability. Sensor observations complement, rather than replace, the wider evidence and confidence model. Explore live telemetry on Exploitation Signals.

Can teams consume the feed through RSS or an API?

Yes. Previdian provides a free RSS feed, a free JSON feed, and a Pro API for deeper evidence, available telemetry, and integration-oriented workflows. See API & Integrations and API docs.

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