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CVE-2016-6401

20
FAUCET Score

CVE-2016-6401 describes a denial-of-service vulnerability in Cisco Carrier Routing System (CRS) versions 5.1 and 5.1.4, specifically impacting CRS-1 and CRS-3 devices. An attacker can trigger a line-card reload by sending crafted IPv6-over-MPLS packets. This vulnerability has a CVSSv3 score of 5.3 (Medium), indicating an adjacent network attack vector with high impact on availability, but requiring high attack complexity. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
5.1.4CPE matchmatch criteria
cpe:2.3:a:cisco:carrier_routing_system:5.1.4:*:*:*:*:*:*:*
5.1_baseCPE matchmatch criteria
cpe:2.3:a:cisco:carrier_routing_system:5.1_base:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 94th percentile among its peer group of 1,749 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160914-crs
Vendor Advisory
securityfocus.com / bid/92964
securitytracker.com / id/1036830