CVE-2019-15261: Cisco Aironet 1810 Firmware

High severity, CVSS 8.6. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability in the Point-to-Point Tunneling Protocol (PPTP) VPN packet processing functionality in Cisco Aironet Access Points (APs) could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Generic Routing Encapsulation (GRE) frames that pass through the data plane of an affected AP. An attacker could exploit this vulnerability by associating to a vulnerable AP, initiating a PPTP VPN connection to an arbitrary PPTP VPN server, and sending a malicious GRE frame through the data plane of the AP. A successful exploit could allow the attacker to cause an internal process of the targeted AP to crash, which in turn would cause the AP to reload. The AP reload would cause a DoS condition for clients that are associated with the AP.

Affected products

• Cisco Aironet 1810 Firmware: from 8.4, before 8.5.151.0 (fixed in 8.5.151.0); from 8.8, before 8.8.125.0 (fixed in 8.8.125.0); from 8.9, before 8.9.111.0 (fixed in 8.9.111.0)
• Cisco Aironet 1830 Firmware: from 8.4, before 8.5.151.0 (fixed in 8.5.151.0); from 8.8, before 8.8.125.0 (fixed in 8.8.125.0); from 8.9, before 8.9.111.0 (fixed in 8.9.111.0)
• Cisco Aironet 1850 Firmware: from 8.4, before 8.5.151.0 (fixed in 8.5.151.0); from 8.8, before 8.8.125.0 (fixed in 8.8.125.0); from 8.9, before 8.9.111.0 (fixed in 8.9.111.0)

Published 2019-10-16. Last modified 2026-06-17.