{"id":"CVE-2021-21995","aliases":["EUVD-2021-9166","GHSA-x2m6-68vv-69j3"],"status":"published","title":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue...","description":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00961,"percentile":0.61801,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2021-07-13T18:05:49Z","modified":"2026-06-17T03:36:31Z","products":[{"vendor":"vmware","product":"cloud_foundation"},{"vendor":"vmware","product":"esxi"}],"references":[{"url":"https://www.vmware.com/security/advisories/VMSA-2021-0014.html","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21995"},{"url":"https://github.com/advisories/GHSA-x2m6-68vv-69j3"}],"sources":{"cve":[{"id":"CVE-2021-21995","description":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.","status":"published","published":"2021-07-13T18:05:49Z","modified":"2024-08-03T18:30:23.592Z","updated_at":"2026-11-02T14:33:00.488332Z"}],"euvd":[{"id":"EUVD-2021-9166","description":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.","status":"published","published":"2021-07-13T18:05:49Z","modified":"2024-08-03T18:30:23Z","updated_at":"2026-11-03T03:25:04.094929Z"}],"ghsa":[{"id":"GHSA-x2m6-68vv-69j3","title":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue...","description":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.","status":"published","published":"2022-05-24T19:07:32Z","modified":"2023-01-30T05:00:41Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:46:15.397604Z"}],"nvd":[{"id":"CVE-2021-21995","description":"OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.","status":"published","published":"2021-07-13T19:15:09.367Z","modified":"2026-06-17T03:36:31.39Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:06:55.747384Z"}]}}