Microsoft & Adobe Patch Tuesday (May 2021) – Qualys covers 85 Vulnerabilities, 26 Critical

Anand Paturi

Microsoft Patch Tuesday – May 2021

Microsoft patched 55 CVEs in their May 2021 Patch Tuesday release, of which 4 are rated as critical severity. Three 0-day vulnerability patches were included in the release. As of this publication date, none have been exploited.

Qualys released 12 QIDs on the same day, providing vulnerability detection and patch management coverage (where applicable) for all 55 CVEs and the related KBs.

Critical Microsoft vulnerabilities patched:

CVE-2021-31181 – SharePoint Remote Code Execution Vulnerability

Microsoft released patches addressing a critical RCE vulnerability in SharePoint (CVE-2021-31181). This CVE has a high likelihood of exploitability and is assigned a CVSSv3 base score of 8.8 by the vendor.

CVE-2021-31166 – HTTP Protocol Stack Remote Code Execution Vulnerability

Microsoft released patches addressing a critical RCE vulnerability in Windows. This vulnerability allows an unauthenticated attacker to remotely execute code as kernel. This is a wormable vulnerability where an attacker can simply send a malicious crafted packet to the target impacted web-server. CVE has a high likelihood of exploitability and is assigned a CVSSv3 base score of 9.8 by the vendor.

CVE-2021-28476 – Hyper-V Remote Code Execution Vulnerability

Microsoft released patches addressing a critical RCE in Windows Server that impacts Hyper-V. Though the exploitation of this vulnerability is less likely (according to Microsoft), this should be prioritized for patching since adversaries can abuse this vulnerability and cause Denial of Service (DoS) in the form of a bug check. This CVE is assigned a CVSSv3 base score of 9.9 by the vendor.

Three 0-day vulnerabilities patched:

  • CVE-2021-31204 – .NET and Visual Studio Elevation of Privilege Vulnerability
  • CVE-2021-31207 – Microsoft Exchange Server Security Feature Bypass Vulnerability
  • CVE-2021-31200 – Common Utilities Remote Code Execution Vulnerability

Qualys QIDs Providing Coverage

QIDTitleSeverityCVE ID
100415Microsoft Internet Explorer Security Update for May 2021MediumCVE-2021-26419
91762Microsoft SharePoint Enterprise Server Multiple Vulnerabilities May 2021HighCVE-2021-31181
CVE-2021-31173
CVE-2021-31172
CVE-2021-31171
CVE-2021-26418
CVE-2021-28478
CVE-2021-28474
110381Microsoft Office and Microsoft Office Services and Web Apps Security Update May 2021HighCVE-2021-31180
CVE-2021-31179
CVE-2021-31178
CVE-2021-31177
CVE-2021-31176
CVE-2021-31175
CVE-2021-31174
CVE-2021-28455
110382Microsoft Skype for Business Server Security and Lync Server Update for May 2021HighCVE-2021-26421
CVE-2021-26422
375556Visual Studio Code Remote Code Execution VulnerabilityHighCVE-2021-31214
CVE-2021-31211
375557Visual Studio Code Remote Development for Containers Extension Remote Code Execution VulnerabilityMediumCVE-2021-31213
50111Microsoft Exchange Server Multiple Vulnerabilities – May 2021HighCVE-2021-31209
CVE-2021-31207
CVE-2021-31198
CVE-2021-31195
91762Microsoft Windows Security Update for May 2021CriticalCVE-2021-31192
CVE-2021-31188
CVE-2021-31170
CVE-2021-28476
CVE-2021-31184
CVE-2021-31190
CVE-2021-31167
CVE-2021-31168
CVE-2021-31208
CVE-2021-31169
CVE-2021-31165
CVE-2021-1720
CVE-2021-28479
CVE-2021-31185
CVE-2021-31194
CVE-2021-31191
CVE-2021-31186
CVE-2021-31205
CVE-2021-31193
CVE-2021-31187
CVE-2020-26144
CVE-2020-24587
CVE-2020-24588
91763Microsoft Visual Studio Security Update for May 2021HighCVE-2021-27068
CVE-2021-31204
91764Microsoft Windows Web Media Extensions Remote Code Execution VulnerabilityHighCVE-2021-28465
91766Microsoft .NET Core Security Update May 2021MediumCVE-2021-31204
91767Microsoft Windows HTTP Protocol Stack Remote Code Execution Vulnerability – May 2021CriticalCVE-2021-31166

Adobe Patch Tuesday – May 2021

Adobe addressed 46 CVEs this Patch Tuesday, of which 26 are rated as critical severity, including one critical 0-day (CVE-2021-28550) impacting Adobe Acrobat and Reader product.

Adobe products patches include the following: Experience Manager, InDesign, Illustrator, InCopy, Genuine Service, Acrobat and Reader, Magento, Creative Cloud Desktop Application, Media Encoder, After Effects, Medium, and Animate products.

Qualys released 5 QIDs on the same day, providing vulnerability detection for 30 of the 46 CVEs, including 8 rated as critical.

One 0-day vulnerability patched:

CVE-2021-28550

This is a Remote Code Execution vulnerability impacting Adobe Acrobat and Reader and is being actively exploited in the wild on Windows devices. Adversaries are able to execute arbitrary code in windows, including installing malicious applications and gaining complete access to target machines.

Adobe Security BulletinQIDSeverityCVE ID
APSB21-22 Security updates available for Adobe InDesign375549Critical
Critical
Critical
CVE-2021-21098
CVE-2021-21099
CVE-2021-21043
APSB21-24 Security update available for Adobe Illustrator375551Critical
Critical
Critical
Critical
Critical
CVE-2021-21101
CVE-2021-21103
CVE-2021-21104
CVE-2021-21105
CVE-2021-21102
APSB21-29 Security update available for Adobe Acrobat and Reader375547Important
Critical
Important
Critical
Important
Critical
Critical
Critical
Critical
Critical
Important
Critical
Critical
Critical
CVE-2021-28561
CVE-2021-28560
CVE-2021-28558
CVE-2021-28557
CVE-2021-28555
CVE-2021-28565
CVE-2021-28564
CVE-2021-21044
CVE-2021-21038
CVE-2021-21086
CVE-2021-28559
CVE-2021-28562
CVE-2021-28550
CVE-2021-28553
APSB21-32 Security update available for Adobe Media Encoder375550ImportantCVE-2021-28569
APSB21-35 Security update available for Adobe Animate7375553Important
Important
Important
Important
Important
Critical
Critical
CVE-2021-28572
CVE-2021-28573
CVE-2021-28574
CVE-2021-28575
CVE-2021-28576
CVE-2021-28578
CVE-2021-28577

Discover Patch Tuesday Vulnerabilities in VMDR

Qualys VMDR automatically detects new Patch Tuesday vulnerabilities using continuous updates to its Knowledge Base (KB).

You can see all your impacted hosts by these vulnerabilities using the following QQL query:

vulnerabilities.vulnerability:(qid:`50111` OR qid:`91762` OR qid:`91763` OR qid:`91764` OR qid:`91766` OR qid:`91767` OR qid:`100415` OR qid:`110380` OR qid:`110381` OR qid:`110382` OR qid:`375547` OR qid:`375549` OR qid:`375550` OR qid:`375551` OR qid:`375553` OR qid:`375556` OR qid:`375557`)

Respond by Patching

VMDR rapidly remediates Windows hosts by deploying the most relevant and applicable per-technology version patches. You can simply select respective QIDs in the Patch Catalog and filter on the “Missing” patches to identify and deploy the applicable, available patches in one go.

The following QQL will return the missing patches pertaining to this Patch Tuesday.

qid:`50111` OR qid:`91762` OR qid:`91763` OR qid:`91764` OR qid:`91766` OR qid:`91767` OR qid:`100415` OR qid:`110380` OR qid:`110381` OR qid:`110382` OR qid:`375547` OR qid:`375549` OR qid:`375550` OR qid:`375551` OR qid:`375553` OR qid:`375556` OR qid:`375557`

Patch Tuesday Dashboard

The current updated Patch Tuesday dashboards are available in Dashboard Toolbox: 2021 Patch Tuesday Dashboard.

Webinar Series: This Month in Patches

To help customers leverage the seamless integration between Qualys VMDR and Patch Management and reduce the median time to remediate critical vulnerabilities, the Qualys Research team is hosting a monthly webinar series This Month in Patches.

We discuss some of the key vulnerabilities disclosed in the past month and how to patch them:

  • 21Nails Exim Mail Server Multiple Vulnerabilities
  • Pulse Connect Secure Remote Code Execution Vulnerability (CVE-2021-22893)
  • Microsoft Patch Tuesday, May 2021

Join us live or watch on demand!

About Patch Tuesday

Patch Tuesday QIDs are published at Security Alerts, typically late in the evening of Patch Tuesday, followed shortly after by PT dashboards.

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