CVE-2019-1918: 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 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 IS–IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending specific link-state PDUs to an affected system to be processed. A successful exploit could allow the attacker to cause incorrect calculations used in the weighted remote shared risk link groups (SRLG) or in the IGP Flexible Algorithm. It could also cause tracebacks to the logs or potentially cause the receiving device to crash the IS–IS process, resulting in a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | >=6.5.2<6.6.3 | |
| Cisco Carrier Routing System | =6.5.1 | |
| Cisco Carrier Routing System | =6.5.3 |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1918?
CVE-2019-1918 is a vulnerability in the implementation of Intermediate System-to-Intermediate System (IS-IS) routing protocol functionality in Cisco IOS XR Software.
How does CVE-2019-1918 impact Cisco IOS XR Software?
CVE-2019-1918 allows an unauthenticated attacker in the same IS-IS area to cause a denial of service (DoS) condition.
What is the severity of CVE-2019-1918?
CVE-2019-1918 has a severity rating of 7.4 (High).
Which software versions are affected by CVE-2019-1918?
Cisco IOS XR Software versions between 6.5.2 and 6.6.3 are affected by CVE-2019-1918.
How can I fix CVE-2019-1918?
To fix CVE-2019-1918, it is recommended to upgrade to a fixed software version provided by Cisco.
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