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Sep 28, 2021
UPDATE: Critical VMware vCenter Vulnerability
THE THREAT UPDATE: Exploitation of CVE-2021-22005 has been identified in the wild. Fully functional Proof-of-Concept (PoC) exploit code for CVE-2021-22005 was publicly released on September 27th. The release of PoC code is expected to result in widespread exploitation of the vulnerability in the immediate future. Organizations need to ensure that either the VMware security patches, or temporary…
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eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1000+ organizations in 70+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
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Oct 12, 2021
eSentire Launches MDR with Microsoft Azure Sentinel Extending Response Capabilities Across Entire Microsoft Security Ecosystem
Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
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Security advisories — Feb 09, 2021

Microsoft Patch Tuesday – Critical Vulnerabilities


In Microsoft’s February Patch Tuesday release, fifty-eight separate vulnerabilities received security patches. Five vulnerabilities from this release stand out as especially concerning.

Microsoft identified a zero-day vulnerability (CVE-2021-1732) impacting Windows 10 devices. The vulnerability has been exploited in the wild prior to patch release for privilege escalation. Additionally, Microsoft released fixes for multiple vulnerabilities in their implementation of TCP/IP (CVE-2021-24074, CVE-2021-24094, and CVE-2021-24086) affecting multiple Windows products. Lastly, Microsoft patched a critical vulnerability in the Windows Fax Service (CVE-2021-24077), that could be exploited to cause remote code execution. These vulnerabilities have not been exploited in the wild at this time, but exploitation is expected in the near future.

It is recommended that organizations apply patches for all impacted products as soon as possible.

What we’re doing about it

What you should do about it

Additional information

Windows Win32k Elevation of Privilege Vulnerability

CVE-2021-1732 (CVSS:3.0 7.8)

A vulnerability exists in the core system component of Windows which could grant system level access when executed. This is a zero-day vulnerability, meaning exploitation in the wild has been identified. Exploitation requires the ability to execute code locally on a device. For a list of affected Windows versions, see Microsoft’s Update Guide.

Multiple Vulnerabilities in Windows implementation of TCP/IP

CVE-2021-24074 (CVSS:3.0 9.8)

CVE-2021-24094 (CVSS:3.0 9.8)

CVE-2021-24086 (CVSS:3.0 7.5)

Microsoft released security updates for three vulnerabilities impacting their implementation of networking TCP/IP protocols. These vulnerabilities affect all Windows versions and should be prioritized for patching or mitigated with workarounds. In their blog post, Microsoft states the vulnerabilities were discovered internally and creating working remote code execution exploits would be complex. Microsoft does warn that Denial-of-Service exploits are more likely to emerge. There is currently no known exploitation of these vulnerabilities in the wild.

Windows Fax Service Remote Code Execution Vulnerability

CVE-2021-24077 (CVSS:3.0 9.8)

A remotely exploitable vulnerability exists in Windows Fax Service. An attacker with network access to a vulnerable device can execute code. In order to exploit this vulnerability, both the Windows Fax and Scan feature and Fax service need to be enabled and running. This vulnerability was discovered by 3rd parties and technical details or proof-of-concept exploits are not public. There are no reports of in-the-wild exploits at this time. For a list of affected Windows versions see Microsoft’s Update Guide.


[1] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732

[2] https://msrc-blog.microsoft.com/2021/02/09/multiple-security-updates-affecting-tcp-ip/

[3] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24077