What is CVE-2017-6678?

CVE-2017-6678 is a high-severity vulnerability in Cisco Virtualized Packet Core, classified under CWE-399. CVSS score: 7.5/10. Published 2017-06-26.

How severe is CVE-2017-6678?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Cisco Virtualized Packet Core

CVE-2017-6678

A vulnerability in the ingress UDP packet processing functionality of Cisco Virtualized Packet Core-Distributed Instance (VPC-DI) Software 19.2 through 21.0 could allow an unauthenticated, remote attacker to cause both control function (CF) instances on an affected system to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient handling of user-supplied data by the affected software. An attacker could exploit this vulnerability by sending crafted UDP packets to the distributed instance (DI) network addresses of both CF instances on an affected system. A successful exploit could allow the attacker to cause an unhandled error condition on the affected system, which would cause the CF instances to reload and consequently cause the entire VPC to reload, resulting in the disconnection of all subscribers and a DoS condition on the affected system. This vulnerability can be exploited via IPv4 traffic only. Cisco Bug IDs: CSCvc01665 CSCvc35565.

Published 2017-06-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.017 (77.4th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Cisco Virtualized Packet Core — versions v19.2_base, v19.3_base, v20.0_base
Cisco Virtualized Packet Core-Distributed Instance — versions Cisco Virtualized Packet Core-Distributed Instance

Weakness classification (CWE)

References

www.securityfocus.com/bid/99195 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621… (Vendor Advisory)

Frequently asked questions

What is CVE-2017-6678?: CVE-2017-6678 is a high-severity vulnerability in Cisco Virtualized Packet Core, classified under CWE-399. CVSS score: 7.5/10. Published 2017-06-26.
How severe is CVE-2017-6678?: High severity. CVSS v3 base score is 7.5 out of 10.