Cisco IP Phone 8851 Firmware vulnerabilities

21 CVEs affecting Cisco IP Phone 8851 Firmware, 1 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2025-20351, published 2025-10-15.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2020-3161: Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability, published 2020-04-15. Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2021-11-03. EPSS: 83.9% chance of exploitation in the next 30 days. A vulnerability in the web server for Cisco IP Phones could allow an unauthenticated, remote attacker to execute code with root privileges or cause a reload of an affected IP phone, resulting in a…
CVE-2023-20078, published 2023-03-03. Critical severity, CVSS 9.8. EPSS: 10.4% chance of exploitation in the next 30 days. Multiple vulnerabilities in the web-based management interface of certain Cisco IP Phones could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS)…
CVE-2023-20079, published 2023-03-03. High severity, CVSS 7.5. EPSS: 10.3% chance of exploitation in the next 30 days. Multiple vulnerabilities in the web-based management interface of certain Cisco IP Phones could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS)…
CVE-2020-3574, published 2020-11-06. High severity, CVSS 7.5. EPSS: 8% chance of exploitation in the next 30 days. A vulnerability in the TCP packet processing functionality of Cisco IP Phones could allow an unauthenticated, remote attacker to cause the phone to stop responding to incoming calls, drop connected…
CVE-2022-20968, published 2022-12-12. High severity, CVSS 8.8. EPSS: 6.4% chance of exploitation in the next 30 days. A vulnerability in the Cisco Discovery Protocol processing feature of Cisco IP Phone 7800 and 8800 Series firmware could allow an unauthenticated, adjacent attacker to cause a stack overflow on an…
CVE-2020-3111, published 2020-02-05. High severity, CVSS 8.8. EPSS: 3.1% chance of exploitation in the next 30 days. A vulnerability in the Cisco Discovery Protocol implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload…
CVE-2019-1635, published 2019-05-03. High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days. A vulnerability in the call-handling functionality of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to…
CVE-2019-1922, published 2019-07-06. High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days. A vulnerability in Cisco SIP IP Phone Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an…
CVE-2019-1684, published 2019-02-21. Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days. A vulnerability in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series could allow an unauthenticated, adjacent attacker to…
CVE-2019-16008, published 2020-01-26. Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days. A vulnerability in the web-based GUI of Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS)…

Latest

CVE-2025-20351, published 2025-10-15. Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days. A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote…
CVE-2025-20350, published 2025-10-15. High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days. A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote…
CVE-2025-20336, published 2025-09-03. High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days. A vulnerability in the directory permissions of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to access…
CVE-2025-20335, published 2025-09-03. Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days. A vulnerability in the directory permissions of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to write…
CVE-2021-1379, published 2024-11-18. Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days. 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,…
CVE-2024-20445, published 2024-11-06. Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days. A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 could allow an unauthenticated, remote attacker to access sensitive…
CVE-2023-20018, published 2023-01-20. Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days. A vulnerability in the web-based management interface of Cisco IP Phone 7800 and 8800 Series Phones could allow an unauthenticated, remote attacker to bypass authentication on an affected device. …