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CVE-2015-6279

21
FAUCET Score

CVE-2015-6279 describes a denial-of-service vulnerability in the IPv6 snooping functionality of Cisco IOS and IOS XE. A remote attacker can trigger a device reload by sending a malformed Neighbor Discovery (ND) packet containing a Cryptographically Generated Address (CGA) option. With a CVSS score of 7.8 (High), this vulnerability allows an unauthenticated attacker to cause a complete system outage with low attack complexity. Although no public exploit code or active exploitation has been observed, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
12.2\(50\)syCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(50\)sy:*:*:*:*:*:*:*
12.2\(50\)sy1CPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(50\)sy1:*:*:*:*:*:*:*
12.2\(50\)sy2CPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(50\)sy2:*:*:*:*:*:*:*
12.2\(50\)sy3CPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(50\)sy3:*:*:*:*:*:*:*
12.2\(50\)sy4CPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(50\)sy4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.22%
Probability of exploitation in next 30 days
EPSS Percentile
86.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0322 is in the 77th percentile among its peer group of 51,506 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, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

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-20150923-fhs
Vendor Advisory
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20150923-fhs/cvrf/cisco-sa-20150923-fhs_cvrf.xml
Vendor Advisory
securitytracker.com / id/1033647
Third Party AdvisoryVDB Entry