Out-of-bounds Read in Microsoft Windows
CVE-2021-21989
VMware Workstation (16.x prior to 16.1.2) and Horizon Client for Windows (5.x prior to 5.5.2) contain out-of-bounds read vulnerability in the Cortado ThinPrint component (TTC Parser). A malicious actor with access to a virtual machine or remote desktop may be able to exploit these issues leading to information disclosure from the TPView process running on the system where Workstation or Horizon Client for Windows is installed.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Microsoft Windows
- VMware Horizon Client
- VMware Workstation
- VMware Workstation Pro / Player (Workstation), Horizon Client For Windows — versions VMware Workstation (16.x prior to 16.1.2) and Horizon Client for Windows (5.x prior to 5.5.2)
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.vmware.com/security/advisories/VMSA-2021-0009.html (Patch, Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-610/ (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21989?
- CVE-2021-21989 is a medium-severity vulnerability in Microsoft Windows, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2021-05-24.
- How severe is CVE-2021-21989?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-21989 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.