CVE-2019-15261

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-10-16 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:19 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.4% in the next 30 days (EPSS).
• Severity: 8.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-10-16 19:15 UTC

Last modified

2026-06-17 02:19 UTC

Exploit probability

1.4% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco Aironet 1810 Firmware < 8.5.151.0
• Cisco Aironet 1810 Firmware < 8.8.125.0
• Cisco Aironet 1810 Firmware < 8.9.111.0
• Cisco Aironet 1830 Firmware < 8.5.151.0
• Cisco Aironet 1830 Firmware < 8.8.125.0
• Cisco Aironet 1830 Firmware < 8.9.111.0
• Cisco Aironet 1850 Firmware < 8.5.151.0
• Cisco Aironet 1850 Firmware < 8.8.125.0

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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