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CVE-2017-6666

16
FAUCET Score

CVE-2017-6666 describes a denial-of-service vulnerability in Cisco IOS XR Software for Cisco NCS 5500 Series Routers. An authenticated, local attacker could exploit a flaw in the forwarding component to stop data traffic across Traffic Engineering tunnels. This vulnerability has a CVSS v3 score of 6.0 (Medium), indicating a local attack vector with low complexity, requiring high privileges, and resulting in high availability impact. There is no known exploit code available, it is not listed in the KEV catalog, and it has received minimal community discussion or media coverage, suggesting it is not actively exploited.

Impacted Technologies

VendorProductVersion(s)CPE
6.0.0CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xr:6.0.0:*:*:*:*:*:*:*
6.0.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xr:6.0.1:*:*:*:*:*:*:*
6.0_baseCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xr:6.0_base:*:*:*:*:*:*:*
6.1.0CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xr:6.1.0:*:*:*:*:*:*:*
6.1.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios_xr:6.1.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.0MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.5
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.32%
Probability of exploitation in next 30 days
EPSS Percentile
24.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0032 is in the 72nd percentile among its peer group of 3,720 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 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)

ciscoworkaround availablevia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20170607-ncs
MitigationVendor Advisory
securityfocus.com / bid/98987
Third Party AdvisoryVDB Entry
securitytracker.com / id/1038630