Security Experts:

Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Network Security

Cisco Says Hackers Targeting Zero-Days in Carrier-Grade Routers

Cisco has warned that hackers are targeting not one, but two unpatched vulnerabilities in the DVMRP feature of IOS XR software that runs on many carrier-grade routers. 

Cisco has warned that hackers are targeting not one, but two unpatched vulnerabilities in the DVMRP feature of IOS XR software that runs on many carrier-grade routers. 

Over the weekend, the company published an advisory to warn of active attacks targeting a security flaw (CVE-2020-3566) in the Distance Vector Multicast Routing Protocol (DVMRP) feature of IOS XR to cause memory exhaustion denial of service (DoS). 

On Monday, the tech giant has updated the advisory to add another CVE to it, namely CVE-2020-3569, which impacts the very same feature and has similar consequences. 

Both issues, the company reveals, can be exploited remotely, by an unauthenticated attacker, by sending crafted IGMP traffic to a vulnerable device. 

The bugs exist because there is insufficient queue management for Internet Group Management Protocol (IGMP) packets.

According to the company, all Cisco devices that are running any release of IOS XR software are affected, provided that an active interface is configured under multicast routing. Impacted devices include: ASR 9000, NCS 5500, 8000, as well as NCS 540 & 560 series routers.

Cisco has shared information on mitigation steps organizations can take to limit exposure, but has yet to release software updates to address these vulnerabilities. 

No workarounds to address the two issues have been detailed yet, but Cisco has published indicators of compromise to help administrators determine whether attackers are exploiting the vulnerabilities in their devices.

Related: Attackers Actively Targeting Cisco IOS XR Vulnerability

Related: Cisco Patches High-Severity Vulnerabilities in NX-OS Software

Related: Default Credentials Expose Cisco ENCS, CSP Appliances to Attacks

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

Click to comment

Expert Insights

Related Content

Network Security

NSA publishes guidance to help system administrators identify and mitigate cyber risks associated with transitioning to IPv6.

Mobile & Wireless

Technical details published for an Arm Mali GPU flaw leading to arbitrary kernel code execution and root on Pixel 6.

Mobile & Wireless

Apple rolled out iOS 16.3 and macOS Ventura 13.2 to cover serious security vulnerabilities.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

Mobile & Wireless

Apple’s iOS 12.5.7 update patches CVE-2022-42856, an actively exploited vulnerability, in old iPhones and iPads.

Cyberwarfare

Websites of German airports, administration bodies and banks were hit by DDoS attacks attributed to Russian hacker group Killnet

Vulnerabilities

Security researchers have observed an uptick in attacks targeting CVE-2021-35394, an RCE vulnerability in Realtek Jungle SDK.

Mobile & Wireless

Two vulnerabilities in Samsung’s Galaxy Store that could be exploited to install applications or execute JavaScript code by launching a web page.