CVE-2019-1910: Cisco IOS XR Software Intermediate System to Intermediate System Denial of Service Vulnerability
First published: Wed Aug 07 2019(Updated: )
A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an unauthenticated attacker who is in the same IS–IS area to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of crafted IS–IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending a crafted link-state PDU to an affected system to be processed. A successful exploit could allow the attacker to cause all routers within the IS–IS area to unexpectedly restart the IS–IS process, resulting in a DoS condition. This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco IOS XR Software earlier than Release 6.6.3 and are configured with the IS–IS routing protocol. Cisco has confirmed that this vulnerability affects both Cisco IOS XR 32-bit Software and Cisco IOS XR 64-bit Software.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | <6.6.3 | |
| Cisco Carrier Routing System | =7.0.1 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1910?
CVE-2019-1910 is a vulnerability in the implementation of the Intermediate System-to-Intermediate System (IS-IS) routing protocol in Cisco IOS XR Software, which can allow an unauthenticated attacker in the same IS-IS area to cause a denial of service (DoS) condition.
How does CVE-2019-1910 affect Cisco IOS XR Software?
CVE-2019-1910 affects Cisco IOS XR Software versions up to and excluding 6.6.3.
How does CVE-2019-1910 affect Cisco Carrier Routing System?
CVE-2019-1910 affects Cisco Carrier Routing System version 7.0.1.
What is the severity of CVE-2019-1910?
CVE-2019-1910 has a severity rating of high (7.4).
How can I fix CVE-2019-1910?
Cisco has released software updates to address CVE-2019-1910. Please refer to the Cisco Security Advisory for more information and download the necessary patches.
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