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 update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-6678 is rated Moderate Risk (57.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.74%). EPSS rose +1.25% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-6678

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.48% 1.74% +1.25%
2 2025-03-30 0.61% 0.48% -0.13%
3 2025-03-29 — 0.61% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-6678

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2017-6678

Affected software / configurations for CVE-2017-6678

Vendor Product Version Raw CPE
cisco virtualized_packet_core v19.2_base cpe:2.3:a:cisco:virtualized_packet_core:v19.2_base:*:*:*:*:*:*:*
cisco virtualized_packet_core v19.3_base cpe:2.3:a:cisco:virtualized_packet_core:v19.3_base:*:*:*:*:*:*:*
cisco virtualized_packet_core v20.0_base cpe:2.3:a:cisco:virtualized_packet_core:v20.0_base:*:*:*:*:*:*:*
cisco virtualized_packet_core v20.1_base cpe:2.3:a:cisco:virtualized_packet_core:v20.1_base:*:*:*:*:*:*:*
cisco virtualized_packet_core v20.2_base cpe:2.3:a:cisco:virtualized_packet_core:v20.2_base:*:*:*:*:*:*:*
cisco virtualized_packet_core v21.0_base cpe:2.3:a:cisco:virtualized_packet_core:v21.0_base:*:*:*:*:*:*:*

References for CVE-2017-6678

cvelogic Threat Intelligence