CVE-2017-3876

A vulnerability in the Event Management Service daemon (emsd) of Cisco IOS XR routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the 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 allow the attacker to crash the device in such a manner that manual intervention is required to recover. This vulnerability affects all Cisco IOS XR platforms that are running release 6.1.1 of Cisco IOS XR Software when the gRPC service is enabled on the device. The gRPC service is not enabled by default. Cisco Bug IDs: CSCvb14441.

• CWE-399

• http://www.securityfocus.com/bid/98284Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1038393
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-ios-xrVendor Advisory
• http://www.securityfocus.com/bid/98284Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1038393
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-ios-xrVendor Advisory

Published

May 16, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2017-3870A vulnerability in the URL filtering feature of Cisco AsyncO…
• CVE-2017-3871A RADIUS Secret Disclosure vulnerability in the web network …
• CVE-2017-3872A cross-site scripting (XSS) filter bypass vulnerability in …
• CVE-2017-3873A vulnerability in the Plug-and-Play (PnP) subsystem of the …
• CVE-2017-3874A vulnerability in the web framework of Cisco Unified Commun…
• CVE-2017-3875An Access-Control Filtering Mechanisms Bypass vulnerability …
• CVE-2017-3877A vulnerability in the web framework of Cisco Unified Commun…
• CVE-2017-3878A Denial of Service vulnerability in the Telnet remote login…
• CVE-2017-3879A Denial of Service vulnerability in the remote login functi…
• CVE-2017-3880An Authentication Bypass vulnerability in Cisco WebEx Meetin…
• CVE-2017-3881A vulnerability in the Cisco Cluster Management Protocol (CM…9.8
• CVE-2017-3882A vulnerability in the Universal Plug-and-Play (UPnP) implem…