Resource exhaustion in Cisco 1100 Integrated Services Router
CVE-2020-3479
A vulnerability in the implementation of Multiprotocol Border Gateway Protocol (MP-BGP) for the Layer 2 VPN (L2VPN) Ethernet VPN (EVPN) address family in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted EVPN attributes. An attacker could exploit this vulnerability by sending BGP update messages with specific, malformed attributes to an affected device. A successful exploit could allow the attacker to cause an affected device to crash, resulting in a DoS condition.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.011 (63.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H.
Affected products
- Cisco 1100_integrated_services_router
- Cisco 1101_integrated_services_router
- Cisco 1109_integrated_services_router
- Cisco 1111x_integrated_services_router
- Cisco 111x_integrated_services_router
- Cisco 1120_integrated_services_router
- Cisco 1160_integrated_services_router
- Cisco 4221_integrated_services_router
- Cisco 4321_integrated_services_router
- Cisco 4331_integrated_services_router
Weakness classification (CWE)
References
- psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-3479?
- CVE-2020-3479 is a medium-severity vulnerability in Cisco 1100 Integrated Services Router, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2020-09-24.
- How severe is CVE-2020-3479?
- Medium severity. CVSS v3 base score is 6.1 out of 10.