A vulnerability in the Forwarding Information Base (FIB) code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, network attacker to cause a denial of service (DoS) condition. The vulnerability is due to a limitation in the way the FIB is internally representing recursive routes. An attacker could exploit this vulnerability by injecting routes into the routing protocol that have a specific recursive pattern. The attacker must be in a position on the network that provides the ability to inject a number of recursive routes with a specific pattern. An exploit could allow the attacker to cause an affected device to reload, creating a DoS condition. Cisco Bug IDs: CSCva91655.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.3, indicating it can be exploited remotely over the network but requires specific conditions to be met without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 1 product from cisco organizations running these solutions should prioritize assessment and patching.
First disclosed in 2018, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.
2018-03-28T22:29:02.000
2026-06-17T01:30:09.967
Modified
CVSSv3.0: 5.3 (MEDIUM)
AV:N/AC:M/Au:N/C:N/I:N/A:C
8.6
6.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Operating System | cisco | ios_xe | < 15.5\(3\)s5 | Yes |
| Operating System | cisco | ios_xe | < 15.5\(3\)m5 | Yes |
| Operating System | cisco | ios_xe | < 15.4\(3\)s7 | Yes |
| Operating System | cisco | ios_xe | < 15.4\(2\)s1 | Yes |
| Operating System | cisco | ios_xe | < 15.4\(1\)s1 | Yes |
| Operating System | cisco | ios_xe | < 15.4\(1\)s0a | Yes |
| Operating System | cisco | ios_xe | < 15.2\(5\)e1 | Yes |
| Operating System | cisco | ios_xe | < 15.2\(4\)e5 | Yes |
| Operating System | cisco | ios_xe | < 15.2\(2\)e1 | Yes |
| Operating System | cisco | ios_xe | < 15.2\(1\)e1 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.