What’s Vulnerable › Vulnerabilities

CVE-2019-1711: Cisco IOS XR gRPC Software Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-17 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the Event Management Service daemon (emsd) of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of gRPC requests. An attacker could exploit this vulnerability by repeatedly sending unauthenticated gRPC requests to the affected device. A successful exploit could cause the emsd process to crash, resulting in a DoS condition. Resolved in Cisco IOS XR 6.5.1 and later.

Affected products

• Cisco IOS XR Software: from 6.1.0 before 6.5.1 — fixed in 6.5.1

How to fix

Upgrade to a fixed version: Cisco IOS XR Software 6.5.1. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/108017
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-ios-xr-dos
• http://www.securityfocus.com/bid/108017
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-ios-xr-dos

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