{"id":"CVE-2021-40112","aliases":["EUVD-2021-27299","GHSA-xj98-pcc3-hvhq"],"status":"published","title":"Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities","description":"Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.","severity":{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01386,"percentile":0.72584,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-284"],"published":"2021-11-04T15:35:33Z","modified":"2026-06-17T04:06:32Z","products":[{"vendor":"cisco","product":"catalyst_pon_switch_cgp-ont-1p_firmware"},{"vendor":"cisco","product":"catalyst_pon_switch_cgp-ont-4p_firmware"},{"vendor":"cisco","product":"catalyst_pon_switch_cgp-ont-4pv_firmware"},{"vendor":"cisco","product":"catalyst_pon_switch_cgp-ont-4pvc_firmware"},{"vendor":"cisco","product":"catalyst_pon_switch_cgp-ont-4tvcw_firmware"},{"vendor":"cisco","product":"cisco catalyst pon series"}],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-catpon-multivulns-CE3DSYGr","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40112"},{"url":"https://github.com/advisories/GHSA-xj98-pcc3-hvhq"}],"sources":{"cve":[{"id":"CVE-2021-40112","title":"Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities","description":"Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.","status":"published","published":"2021-11-04T15:35:33.328Z","modified":"2024-11-07T21:57:28.796Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27299","description":"Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.","status":"published","published":"2021-11-04T15:35:33Z","modified":"2024-11-07T21:57:28Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:05:07.279991Z"}],"ghsa":[{"id":"GHSA-xj98-pcc3-hvhq","title":"Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive...","description":"Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.","status":"published","published":"2022-05-24T19:19:45Z","modified":"2023-01-27T05:03:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:42:20.442744Z"}],"nvd":[{"id":"CVE-2021-40112","description":"Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.","status":"published","published":"2021-11-04T16:15:09.14Z","modified":"2026-06-17T04:06:32.517Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:07:00.549994Z"}]}}