Buffer overflow in VMware Cloud Foundation
CVE-2021-21974
OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.451 (98.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.451 · newest: 0.451 · change: 0.000
Affected products
- VMware Cloud Foundation
- VMware Esxi — versions 6.5, 6.7, 7.0.0
- VMware Cloud Foundation — versions 4.x before 4.2 and 3.x
- VMware Esxi — versions 7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.vmware.com/security/advisories/VMSA-2021-0002.html (Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-250/ (VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html (Exploit, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21974?
- CVE-2021-21974 is a high-severity vulnerability in VMware Cloud Foundation, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2021-02-24.
- How severe is CVE-2021-21974?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-21974 known to be exploited?
- 42 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.