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CVE-2015-6393

20
FAUCET Score

CVE-2015-6393 is a denial-of-service vulnerability affecting various Cisco Nexus switches running specific NX-OS versions, where malformed IPv4 DHCP packets sent to the DHCPv4 relay agent can cause a device crash. Rated 7.5 HIGH, this vulnerability is remotely exploitable with low attack complexity and no user interaction, leading to high availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.2\(1\)n1\(1\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:4.2\(1\)n1\(1\):*:*:*:*:*:*:*
4.2\(1\)n2\(1\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:4.2\(1\)n2\(1\):*:*:*:*:*:*:*
4.2\(1\)n2\(1a\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:4.2\(1\)n2\(1a\):*:*:*:*:*:*:*
5.0\(2\)n1\(1\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:5.0\(2\)n1\(1\):*:*:*:*:*:*:*
5.0\(2\)n2\(1\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:5.0\(2\)n2\(1\):*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.91%
Probability of exploitation in next 30 days
EPSS Percentile
77.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0191 is in the 61st percentile among its peer group of 51,466 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

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-20161005-dhcp2
Vendor Advisory
securityfocus.com / bid/93419
securitytracker.com / id/1036949