# CVE-2017-12319: Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability

Source: https://junglewise.ai/threats/cve-2017-12319-cisco-ios-xe-software-ethernet-virtual-private-network-border  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2017-12319 · Severity: critical · CVSS 5.9 · Exploited in the wild · Published 2022-03-03

A vulnerability in the BGP implementation for Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) or corrupt the BGP routing table. The issue stems from a miscalculation of the IP address length field when processing BGP Inclusive Multicast Ethernet Tag Route or MAC/IP Advertisement Route update packets.

Technologies: [Cisco IOS XE](https://junglewise.ai/threats/technologies/ios-xe), [Cisco IOS XE Software](https://junglewise.ai/threats/technologies/ios-xe-software). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2017-12319 exploited in the wild?** Yes. CVE-2017-12319 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.

**How severe is CVE-2017-12319?** Critical severity, with a CVSS score of 5.9, published 3 March 2022.

**Which products and versions are affected?** Cisco IOS XE prior to 16.3.

**Is there a fix for CVE-2017-12319?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2017-12319 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2017-12319?** Check whether you run Cisco IOS XE or Cisco IOS XE Software. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Cisco IOS XE prior to 16.3

## Timeline

- 2017-11-03: disclosed: Initial Cisco advisory publication
- 2022-03-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

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