CVE Feed

    Dashboard / CVE / CVE-2021-21974

    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.

    Published:Feb 24, 2021
    Last Modified:Jun 2, 2026
    EPS:Feb 24, 2021
    EPSS Score:0.557
    CVSS Score:8.8

    Affected Products

    Vendor
    Vmware
    Product
    Cloud Foundation
    Vendor
    Vmware
    Product
    Esxi

    Exploits

    http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.htmlhttp://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.htmlhttps://github.com/abirasecurity/CVE-2021-21974_vuln_dectectionhttps://github.com/Aiyakami/CVE-2021-21974https://github.com/CYBERTHREATANALYSIS/ESXi-Ransomware-Scanner-mihttps://github.com/hateme021202/cve-2021-21974https://github.com/mercylessghost/CVE-2021-21974https://github.com/n2x4/Feb2023-CVE-2021-21974-OSINThttps://github.com/Shadow0ps/CVE-2021-21974

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-41709 (CVSS 2.7) — VMware ESX contains an insufficient logging vulnerability. A malicious administrator could exploit this issue …
    CVE-2026-41703 (CVSS 7.6) — VMware ESX, Workstation, and Fusion contain an out-of-bounds read vulnerability. A malicious actor with VM dep…
    CVE-2026-47876 (CVSS 9.3) — VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious a…
    CVE-2026-59309 (CVSS 9.8) — VMware vCenter contains an authentication bypass vulnerability in the VMware Directory Service. A malicious ac…
    CVE-2026-59310 (CVSS 9.8) — VMware vCenter contains a directory traversal vulnerability in the Syslog server. A malicious actor with netwo…
    CVE-2026-41724 (CVSS 8) — VMware Cloud Foundation Operations contains multiple stored cross-site scripting vulnerabilities.A malicious a…
    CVE-2026-41723 (CVSS 8) — VMware Cloud Foundation Operations contains multiple stored cross-site scripting vulnerabilities.A malicious a…
    CVE-2026-41722 (CVSS 8) — VMware Cloud Foundation Operations contains multiple stored cross-site scripting vulnerabilities.A malicious a…
    CVE-2026-22721 (CVSS 6.2) — VMware Aria Operations contains a privilege escalation vulnerability. A malicious actor with privileges in vCe…
    CVE-2026-22720 (CVSS 8) — VMware Aria Operations contains a stored cross-site scripting vulnerability. A malicious actor with privileges…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High