{"id":"CVE-2021-21974","aliases":["EUVD-2021-9145","GHSA-4mwc-fv8c-wp9f"],"status":"published","title":"OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5...","description":"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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.45063,"percentile":0.98798,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-787"],"published":"2021-02-24T16:57:33Z","modified":"2026-06-17T03:36:29Z","exploits":[{"source":"pocgithub","id":"Shadow0ps/CVE-2021-21974","title":"Shadow0ps/CVE-2021-21974","date":"2021-05-25","url":"https://github.com/Shadow0ps/CVE-2021-21974"},{"source":"pocgithub","id":"n2x4/Feb2023-CVE-2021-21974-OSINT","title":"n2x4/Feb2023-CVE-2021-21974-OSINT","date":"2023-02-04","url":"https://github.com/n2x4/Feb2023-CVE-2021-21974-OSINT"},{"source":"pocgithub","id":"CYBERTHREATANALYSIS/ESXi-Ransomware-Scanner-mi","title":"CYBERTHREATANALYSIS/ESXi-Ransomware-Scanner-mi","date":"2023-02-08","url":"https://github.com/CYBERTHREATANALYSIS/ESXi-Ransomware-Scanner-mi"},{"source":"pocgithub","id":"hateme021202/cve-2021-21974","title":"hateme021202/cve-2021-21974","date":"2023-10-19","url":"https://github.com/hateme021202/cve-2021-21974"},{"source":"pocgithub","id":"mercylessghost/CVE-2021-21974","title":"mercylessghost/CVE-2021-21974","date":"2025-01-10","url":"https://github.com/mercylessghost/CVE-2021-21974"},{"source":"pocgithub","id":"abirasecurity/CVE-2021-21974_vuln_dectection","title":"abirasecurity/CVE-2021-21974_vuln_dectection","date":"2025-09-04","url":"https://github.com/abirasecurity/CVE-2021-21974_vuln_dectection"},{"source":"pocgithub","id":"Aiyakami/CVE-2021-21974","title":"Aiyakami/CVE-2021-21974","date":"2026-07-08","url":"https://github.com/Aiyakami/CVE-2021-21974"}],"products":[{"vendor":"vmware","product":"cloud_foundation"},{"vendor":"vmware","product":"esxi"},{"vendor":"vmware","product":"vmware cloud foundation"}],"references":[{"url":"https://www.vmware.com/security/advisories/VMSA-2021-0002.html","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-250/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21974"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-250"},{"url":"https://github.com/advisories/GHSA-4mwc-fv8c-wp9f"}],"sources":{"cve":[{"id":"CVE-2021-21974","description":"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.","status":"published","published":"2021-02-24T16:57:33Z","modified":"2026-06-02T20:00:52.08Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-9145","description":"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.","status":"published","published":"2021-02-24T16:57:33Z","modified":"2026-06-02T20:00:52Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:20:55.231104Z"}],"ghsa":[{"id":"GHSA-4mwc-fv8c-wp9f","title":"OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5...","description":"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.","status":"published","published":"2022-05-24T17:43:02Z","modified":"2026-06-02T21:31:36Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:08:30.717444Z"}],"nvd":[{"id":"CVE-2021-21974","description":"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.","status":"published","published":"2021-02-24T17:15:16.017Z","modified":"2026-06-17T03:36:29.087Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5.8,"vector":"AV:A/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:50.031227Z"}]}}