CVE-2019-1849 Cisco IOS XR Software BGP MPLS-Based EVPN Denial of Service Vulnerability
An unauthenticated adjacent attacker can cause a denial of service on Cisco IOS XR devices by injecting malicious EVPN traffic, crashing the l2vpn_mgr process.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1849?
CVE-2019-1849 is a high-severity denial of service vulnerability in Cisco Ios Xr, published on 16 May 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Border Gateway Patrol (BGP) Multiprotocol Label Switching (MPLS)-based Ethernet VPN (EVPN) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs when the affected software processes specific EVPN routing information. An attacker could exploit this vulnerability by injecting malicious traffic patterns into the targeted EVPN network. A successful exploit could result in a crash of the l2vpn_mgr process on Provider Edge (PE) device members of the same EVPN instance (EVI). On each of the affected devices, a crash could lead to system instability and the inability to process or forward traffic through the device, resulting in a DoS condition that would require manual intervention to restore normal operating conditions.
Weakness: CWE-754
Which versions are affected by CVE-2019-1849?
It affects 1 product.
Products include Cisco Ios Xr.
How do I fix CVE-2019-1849?
No fix has been published for CVE-2019-1849 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-1849 being exploited?
There is no known exploitation of CVE-2019-1849 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xr
- CVE-2020-3118 Cisco IOS XR Software Discovery Protocol Format String
- CVE-2020-3569 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2020-3566 Cisco IOS XR Software DVMRP Memory Exhaustion
- CVE-2010-3035 Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service
- CVE-2022-20821 Cisco IOS XR Open Port
Sources
Also known as GHSA-3r3r-w8v7-6jqq.