{"cve":"CVE-2021-1379","nvd":{"published":"2024-11-18T16:15:09.310","modified":"2026-06-17T03:31:38.220","status":"Analyzed","description":"Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone.\r\nThese vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition.Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-120"],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3","https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-distupd-N87eB6Z3"],"products":["cisco:ip_conference_phone_7832_firmware","cisco:ip_conference_phone_7832_with_multiplatform_firmware","cisco:ip_conference_phone_8832_firmware","cisco:ip_conference_phone_8832_with_multiplatform_firmware","cisco:ip_phone_6821_with_multiplatform_firmware","cisco:ip_phone_6841_with_multiplatform_firmware","cisco:ip_phone_6851_with_multiplatform_firmware","cisco:ip_phone_6861_with_multiplatform_firmware","cisco:ip_phone_6871_with_multiplatform_firmware","cisco:ip_phone_7811_firmware","cisco:ip_phone_7811_with_multiplatform_firmware","cisco:ip_phone_7821_firmware","cisco:ip_phone_7821_with_multiplatform_firmware","cisco:ip_phone_7841_firmware","cisco:ip_phone_7841_with_multiplatform_firmware","cisco:ip_phone_7861_firmware","cisco:ip_phone_7861_with_multiplatform_firmware","cisco:ip_phone_8811_firmware","cisco:ip_phone_8811_with_multiplatform_firmware","cisco:ip_phone_8841_firmware","cisco:ip_phone_8841_with_multiplatform_firmware","cisco:ip_phone_8845_firmware","cisco:ip_phone_8845_with_multiplatform_firmware","cisco:ip_phone_8851_firmware","cisco:ip_phone_8851_with_multiplatform_firmware","cisco:ip_phone_8861_firmware","cisco:ip_phone_8861_with_multiplatform_firmware","cisco:ip_phone_8865_firmware","cisco:ip_phone_8865_with_multiplatform_firmware","cisco:spa525g_firmware","cisco:unified_ip_conference_phone_8831_firmware","cisco:unified_ip_conference_phone_8831_for_third-party_call_control_firmware","cisco:wireless_ip_phone_8821-ex_firmware","cisco:wireless_ip_phone_8821_firmware"],"source":"nvd","synced_at":"2026-10-19T21:57:34.731061660+00:00"},"epss":{"cve":"CVE-2021-1379","score":0.00328,"percentile":0.26008,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}