7.8
CWE
134
Advisory Published
Updated

CVE-2017-3859

First published: Wed Mar 22 2017(Updated: )

A vulnerability in the DHCP code for the Zero Touch Provisioning feature of Cisco ASR 920 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a format string vulnerability when processing a crafted DHCP packet for Zero Touch Provisioning. An attacker could exploit this vulnerability by sending a specially crafted DHCP packet to an affected device. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects Cisco ASR 920 Series Aggregation Services Routers that are running an affected release of Cisco IOS XE Software (3.13 through 3.18) and are listening on the DHCP server port. By default, the devices do not listen on the DHCP server port. Cisco Bug IDs: CSCuy56385.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XE Software=3.13.4s
Cisco IOS XE Software=3.13.5as
Cisco IOS XE Software=3.13.5s
Cisco IOS XE Software=3.13.6as
Cisco IOS XE Software=3.13.6s
Cisco IOS XE Software=3.14.3s
Cisco IOS XE Software=3.14.4s
Cisco IOS XE Software=3.15.2s
Cisco IOS XE Software=3.15.3s
Cisco IOS XE Software=3.15.4s
Cisco IOS XE Software=3.16.0cs
Cisco IOS XE Software=3.16.0s
Cisco IOS XE Software=3.16.1as
Cisco IOS XE Software=3.16.1s
Cisco IOS XE Software=3.16.2as
Cisco IOS XE Software=3.16.2bs
Cisco IOS XE Software=3.16.2s
Cisco IOS XE Software=3.16.3as
Cisco IOS XE Software=3.16.3s
Cisco IOS XE Software=3.17.0s
Cisco IOS XE Software=3.17.1as
Cisco IOS XE Software=3.17.1s
Cisco IOS XE Software=3.17.2s
Cisco IOS XE Software=3.18.0as
Cisco IOS XE Software=3.18.0s
Cisco IOS XE Software=3.18.0sp
Cisco IOS XE Software=3.18.1asp
Cisco IOS XE Software=3.18.1bsp
Cisco IOS XE Software=3.18.1csp
Cisco IOS XE Software=3.18.1s
Cisco IOS XE Software=3.18.1sp
Cisco IOS XE Software=3.18.2s
Cisco IOS XE Software=3.18.3vs
Cisco ASR 920-12CZ-A
Cisco ASR 920
Cisco ASR 920 Series
Cisco ASR 920
Cisco ASR 920 Series Router
Cisco ASR 920-24TZ-M
Cisco ASR 920-4SZ-A
Cisco ASR 920-4SZ-D

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Frequently Asked Questions

  • What is the severity of CVE-2017-3859?

    CVE-2017-3859 has a high severity rating due to its potential to allow unauthenticated remote access leading to device reloads.

  • How do I fix CVE-2017-3859?

    To fix CVE-2017-3859, upgrade your Cisco ASR 920 Series router to a version that is not affected by the vulnerability, as recommended by Cisco.

  • What devices are affected by CVE-2017-3859?

    CVE-2017-3859 affects the Cisco ASR 920 Series routers running specific versions of IOS XE, particularly 3.13.4s through 3.18.3vs.

  • Can CVE-2017-3859 be exploited remotely?

    Yes, CVE-2017-3859 can be exploited remotely by an unauthenticated attacker, making it critical to address.

  • What is the cause of CVE-2017-3859?

    CVE-2017-3859 is caused by a format string vulnerability in the DHCP code related to the Zero Touch Provisioning feature.

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