Attacker Value
Low
(1 user assessed)
Exploitability
Unknown
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
1

CVE-2020-3569 - Denial of service vulnerability in Cisco IOS XR

Disclosure Date: August 29, 2020
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually crash. The memory consumption may negatively impact other processes that are running on the device. These vulnerabilities are due to the incorrect handling of IGMP packets. An attacker could exploit these vulnerabilities by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to immediately crash the IGMP process or cause memory exhaustion, resulting in other processes becoming unstable. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address these vulnerabilities.

Add Assessment

3
Ratings
Technical Analysis

Same initial evaluation as CVE-2020-3566—namely that successful exploitation doesn’t appear thus far to yield useful access for attackers, though disruption to critical business services is still a major concern for service providers. If the DoS enables a new threat vector, attacker value on these vulns rises. I’m going to leave exploitability blank for the time being. Rapid7 has analysis here.

CVSS V3 Severity and Metrics
Base Score:
7.5 High
Impact Score:
3.6
Exploitability Score:
3.9
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Vendors

  • Cisco

Products

  • Cisco IOS XR Software

Additional Info

Technical Analysis