CVE-2019-15261: Cisco Aironet Access Points Point-to-Point Tunneling Protocol Denial of Service Vulnerability
First published: Wed Oct 16 2019(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Aironet 1810 Firmware | >=8.4<8.5.151.0 | |
| Cisco Aironet 1810 Firmware | >=8.8<8.8.125.0 | |
| Cisco Aironet 1810 Firmware | >=8.9<8.9.111.0 | |
| Cisco Aironet 1810 | ||
| Cisco Aironet 1830 Firmware | >=8.4<8.5.151.0 | |
| Cisco Aironet 1830 Firmware | >=8.8<8.8.125.0 | |
| Cisco Aironet 1830 Firmware | >=8.9<8.9.111.0 | |
| Cisco Aironet 1830 | ||
| Cisco Aironet 1850 Firmware | >=8.4<8.5.151.0 | |
| Cisco Aironet 1850 Firmware | >=8.8<8.8.125.0 | |
| Cisco Aironet 1850 Firmware | >=8.9<8.9.111.0 | |
| Cisco Aironet 1850 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-15261?
CVE-2019-15261 is a vulnerability in the Point-to-Point Tunneling Protocol (PPTP) VPN packet processing functionality in Cisco Aironet Access Points (APs) that can cause a denial of service (DoS) condition.
How severe is CVE-2019-15261?
CVE-2019-15261 has a severity rating of 8.6, which is considered high.
Which software versions are affected by CVE-2019-15261?
Cisco Aironet 1810 Firmware versions 8.4-8.5.151.0, 8.8-8.8.125.0, and 8.9-8.9.111.0 are affected by CVE-2019-15261.
How can I mitigate CVE-2019-15261?
There is currently no known mitigation for CVE-2019-15261. It is recommended to update to a fixed software version when available.
Where can I find more information about CVE-2019-15261?
You can find more information about CVE-2019-15261 in the Cisco Security Advisory at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191016-airo-pptp-dos.
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