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CVE-2021-21972

Exploited in the wild. In CISA KEV since 2021‑11‑03. Fixed in 3.10.1.2.

CVSS 3.19.8CriticalEPSS percentile99th100% chance in 30 daysCISA KEVListedsince 2021-11-03, due 2021-11-17
Public exploit: 4 sourcesFix3.10.1.2Upgrade to this build

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • n/a VMware vCenter ServerAffected: 7.x before 7.0 U1cUpgrade to: not statedAffected: 6.7 before 6.7 U3lUpgrade to: not statedAffected: 6.5 before 6.5 U3nUpgrade to: not statedStated by: CVE record
  • n/a VMware Cloud FoundationAffected: 4.x before 4.2Upgrade to: not statedAffected: 3.x before 3.10.1.2Upgrade to: not statedStated by: CVE record
  • Vmware Cloud FoundationAffected: ≥ 3.0, < 3.10.1.2Upgrade to: 3.10.1.2Stated by: NVD
  • Broadcom Inc. VMware Cloud FoundationAffected: от 3.0 до 3.10.1.2Upgrade to: not statedStated by: BDU
  • Broadcom Inc. VMware vCenter ServerAffected: от 7.0 до 7.0 U1cUpgrade to: not statedStated by: BDU

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free Nuclei and OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Discuss checks for your systems with a specialist. Scope is agreed before testing.

Coverage timeline

0 publishers

  1. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened.

What it is

From the CVE record

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS99th
Public exploit
CISA KEV
CISA KEV

Listed as exploited in the wild since 2021-11-03.

US federal agencies must remediate by 2021-11-17.

Known use in ransomware campaigns.

Apply updates per vendor instructions.
Public exploits

4 sources with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

100% chance of exploitation activity in the next 30 days, which ranks it in the 99th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

The patch came 127 days before any public exploit.

  1. Patch availablerecord updated
  2. OpenVAS check added
  3. Public exploit / PoCsource: github-pocnuclei check added
  4. Patch availablerecord updated
  5. Added to CISA KEVransomware campaign
  6. Publishedweakness classified, att&ck mapped

Affected products

And 2 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Scored 9.8 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 8 more references. See all after sign-in

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We'll flag the next CVE, public exploit or patch for VMware Cloud Foundation, not every advisory. This one: actively exploited.