{"id":"CVE-2021-20556","aliases":["EUVD-2021-7974","GHSA-4grf-x53v-r95x"],"status":"published","title":"IBM Cognos Controller information disclosure","description":"IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames.  IBM X-Force ID:  199181.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00463,"percentile":0.40585,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-203","CWE-204"],"published":"2024-05-03T17:31:31Z","modified":"2026-06-17T03:34:00Z","products":[{"vendor":"ibm","product":"cognos controller"},{"vendor":"ibm","product":"cognos_controller"}],"references":[{"url":"https://www.ibm.com/support/pages/node/7149876","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/199181","tags":["vdb-entry","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20556"},{"url":"https://github.com/advisories/GHSA-4grf-x53v-r95x"}],"sources":{"cve":[{"id":"CVE-2021-20556","title":"IBM Cognos Controller information disclosure","description":"IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames.  IBM X-Force ID:  199181.","status":"published","published":"2024-05-03T17:31:31.243Z","modified":"2024-08-03T17:45:44.323Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-204"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-7974","description":"IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames.  IBM X-Force ID:  199181.","status":"published","published":"2024-05-03T17:31:31Z","modified":"2024-08-03T17:45:44Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T03:25:08.888273Z"}],"ghsa":[{"id":"GHSA-4grf-x53v-r95x","title":"IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames...","description":"IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames.  IBM X-Force ID:  199181.","status":"published","published":"2024-05-03T18:30:37Z","modified":"2025-01-07T18:30:43Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-203","CWE-204"],"updated_at":"2026-11-02T14:59:23.663731Z"}],"nvd":[{"id":"CVE-2021-20556","description":"IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames.  IBM X-Force ID:  199181.","status":"published","published":"2024-05-03T18:15:07.907Z","modified":"2026-06-17T03:34:00.853Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-204","CWE-203"],"updated_at":"2026-11-02T14:07:08.163458Z"}]}}