Exploited
high
8.8
CWE
787 134
Advisory Published
Updated

CVE-2020-3118: Cisco IOS XR Software Discovery Protocol Format String Vulnerability

First published: Wed Feb 05 2020(Updated: )

A vulnerability in the Cisco Discovery Protocol implementation for Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to execute arbitrary code or cause a reload on an affected device. The vulnerability is due to improper validation of string input from certain fields in Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause a stack overflow, which could allow the attacker to execute arbitrary code with administrative privileges on an affected device. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

Credit: ykramarz@cisco.com psirt@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XRv 9000
Cisco IOS XRv 9000>=6.6.0<6.6.12
Cisco IOS XRv 9000>=7.0.0<7.0.2
Cisco IOS XRv 9000=6.5.3
Cisco ASR 9000v-v2
Cisco ASR 9001
Cisco ASR 9006
Cisco ASR 9010
Cisco ASR 9901-RP Firmware
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9922
Cisco NCS 540-12Z20G-SYS-A
Cisco NCS 540-12Z20G-SYS-D
Cisco NCS 540
Cisco NCS 540-28Z4C-SYS-A
Cisco NCS 540-28Z4C-SYS-D
Cisco NCS 540 Series
Cisco ncs 540x-12z16g-sys-a
Cisco NCS 540X-12Z16G-SYS-D
Cisco NCS 540X-16Z4G8Q2C-A/D
Cisco NCS 540X-16Z4G8Q2C-A/D
Cisco NCS 540
Cisco NCS 5501-SE
Cisco NCS 5501-SE
Cisco NCS 5502
Cisco NCS 5502-SE Firmware
Cisco NCS 5508
Cisco NCS 5516
Cisco IOS XRv 9000
Cisco IOS XRv 9000=5.2.5
Cisco NCS 6000
Cisco NCS 6008-8-Slot Chassis
Cisco IOS XRv 9000=6.4.2
Cisco ASR 9000v
Cisco ASR 9903
Cisco ASR 9920
Cisco CRS-X
Cisco IOS XRv 9000=6.6.25
Cisco NCS 560-4
Cisco IOS XRv 9000=7.0.1
Cisco NCS 540
All of
Cisco IOS XRv 9000=6.5.3
Any of
Cisco ASR 9000v-v2
Cisco ASR 9001
Cisco ASR 9006
Cisco ASR 9010
Cisco ASR 9901-RP Firmware
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9922
Cisco NCS 540-12Z20G-SYS-A
Cisco NCS 540-12Z20G-SYS-D
Cisco NCS 540
Cisco NCS 540-28Z4C-SYS-A
Cisco NCS 540-28Z4C-SYS-D
Cisco NCS 540 Series
Cisco ncs 540x-12z16g-sys-a
Cisco NCS 540X-12Z16G-SYS-D
Cisco NCS 540X-16Z4G8Q2C-A/D
Cisco NCS 540X-16Z4G8Q2C-A/D
Cisco NCS 540
Cisco NCS 5501-SE
Cisco NCS 5501-SE
Cisco NCS 5502
Cisco NCS 5502-SE Firmware
Cisco NCS 5508
Cisco NCS 5516
Cisco IOS XRv 9000
All of
Cisco IOS XRv 9000=5.2.5
Any of
Cisco NCS 6000
Cisco NCS 6008-8-Slot Chassis
All of
Cisco IOS XRv 9000=6.4.2
Any of
Cisco ASR 9000v
Cisco ASR 9000v-v2
Cisco ASR 9001
Cisco ASR 9006
Cisco ASR 9010
Cisco ASR 9901-RP Firmware
Cisco ASR 9903
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9920
Cisco ASR 9922
Cisco CRS-X
All of
Cisco IOS XRv 9000=6.6.25
Cisco NCS 560-4
All of
Cisco IOS XRv 9000=7.0.1
Cisco NCS 540

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-3118?

    CVE-2020-3118 is a vulnerability in the Cisco Discovery Protocol implementation for Cisco IOS XR Software.

  • How does CVE-2020-3118 affect Cisco IOS XR Software?

    CVE-2020-3118 could allow an unauthenticated, adjacent attacker to execute arbitrary code or cause a reload on an affected device.

  • Which versions of Cisco IOS XR Software are affected by CVE-2020-3118?

    Versions between 6.6.0 to 6.6.12 and between 7.0.0 to 7.0.2 of Cisco IOS XR Software are affected by CVE-2020-3118.

  • What is the severity of CVE-2020-3118?

    CVE-2020-3118 has a severity rating of 8.8 (high).

  • How can I fix CVE-2020-3118 in Cisco IOS XR Software?

    To fix CVE-2020-3118, it is recommended to update to a fixed software version as mentioned in the Cisco Security Advisory.

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