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CVE-2019-15261

HIGHCVSS 8.6/10EPSS 1.37%

Last modified

CVE-2019-15261 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 1.37% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability
1.37%

68.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAironet 1810 Firmware>= 8.4, < 8.5.151.0
CiscoAironet 1810 Firmware>= 8.8, < 8.8.125.0
CiscoAironet 1810 Firmware>= 8.9, < 8.9.111.0
CiscoAironet 1830 Firmware>= 8.4, < 8.5.151.0
CiscoAironet 1830 Firmware>= 8.8, < 8.8.125.0
CiscoAironet 1830 Firmware>= 8.9, < 8.9.111.0
CiscoAironet 1850 Firmware>= 8.4, < 8.5.151.0
CiscoAironet 1850 Firmware>= 8.8, < 8.8.125.0
CiscoAironet 1850 Firmware>= 8.9, < 8.9.111.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-15261?
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.
How severe is CVE-2019-15261?
CVE-2019-15261 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.37% probability of exploitation in the next 30 days.
How do I fix CVE-2019-15261?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-15261?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST