Security News > 2020 > September > Cisco Patches Actively Exploited Flaws in Carrier-Grade Routers
Cisco this week released patches for two high-severity vulnerabilities in IOS XR software that have been actively exploited in attacks for over a month.
Tracked as CVE-2020-3566 and CVE-2020-3569 and featuring a CVSS score of 8.6, the two flaws were made public in late August, when Cisco revealed that hackers were already targeting them in attacks.
The two issues were identified in the Distance Vector Multicast Routing Protocol feature of IOS XR and could be exploited without authentication to cause the Internet Group Management Protocol process to exhaust process memory and crash.
The bugs, Cisco explains, exist because IGMP packets are not handled correctly, meaning that crafted IGMP traffic can be sent to the affected devices to trigger them.
All Cisco devices running IOS XR are affected, "If an active interface is configured under multicast routing," and if DVMRP traffic is being received, Cisco explains.
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Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2020-09-23 | CVE-2020-3569 | Allocation of Resources Without Limits or Throttling vulnerability in Cisco IOS XR 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. | 8.6 |
| 2020-08-29 | CVE-2020-3566 | Allocation of Resources Without Limits or Throttling vulnerability in Cisco IOS XR 6.4.2 A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust process memory of an affected device. | 8.6 |