{"id":"CVE-2021-1437","title":"Cisco Aironet Access Points FlexConnect Upgrade Information Disclosure Vulnerability (CVE-2021-1437)","summary":"A vulnerability in the FlexConnect Upgrade feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, remote attacker to obtain confidential information from an affected device.\r\n\r\nThis vulnerability is due to a…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvssSource":"vendor","vendor":"Cisco","product":"Cisco Aironet Access Point Software (IOS XE Controller)","affected":["aironet_access_point_software_ios_xe_controller","aironet_access_point_software"],"published":"2021-03-24","updated":"2021-03-24","sourceUpdated":"2021-03-24T16:00:00+00:00","source":"CSAF","sourceUrl":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-info-disc-BfWqghj","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-info-disc-BfWqghj"},{"url":"https://software.cisco.com"}],"tags":["csaf","vendor-advisory","cisco"],"epss":0.01494,"epssPercentile":0.73028,"ingestedAt":"2026-09-08T15:58:18.538Z","slug":"CVE-2021-1437","body":"## Overview\n\nA vulnerability in the FlexConnect Upgrade feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, remote attacker to obtain confidential information from an affected device.\r\n\r\nThis vulnerability is due to an unrestricted Trivial File Transfer Protocol (TFTP) configuration. An attacker could exploit this vulnerability by sending a specific TFTP request to an affected device. A successful exploit could allow the attacker to download any file from the filesystem of the affected access point (AP).\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\n\n## Vendor advisories\n\n- **cisco-sa-aironet-info-disc-BfWqghj** · Cisco · affected: Cisco Aironet Access Point Software (IOS XE Controller), Cisco Aironet Access Point Software · updated 2021-03-24 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-info-disc-BfWqghj)\n\n**Cisco Aironet Access Points FlexConnect Upgrade Information Disclosure Vulnerability**. Released 2021-03-24.\n\nAffected:\n\n- Cisco Aironet Access Point Software (IOS XE Controller)\n- Cisco Aironet Access Point Software\n\n## Remediation\n\nCisco has released software updates that address this vulnerability. https://software.cisco.com","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}