How severe is CVE-2015-6393?

CVE-2015-6393 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2015-6393 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6393?

CVE-2015-6393 primarily affects Cisco Nx-os. In total, 104 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-6393?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-6393 published?

CVE-2015-6393 was published on 2016-10-06 and last updated on 2026-06-17.

CVE-2015-6393

CVE-2015-6393 is a high-severity vulnerability in Cisco Nx-os with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Nx-os
Published: 2016-10-06
Last modified: 2026-06-17

Description

Cisco NX-OS 4.1 through 7.3 and 11.0 through 11.2 on Nexus 2000, 3000, 3500, 5000, 5500, 5600, 6000, 7000, 7700, and 9000 devices allows remote attackers to cause a denial of service (device crash) via malformed IPv4 DHCP packets to the DHCPv4 relay agent, aka Bug IDs CSCuq39250, CSCus21733, CSCus21739, CSCut76171, and CSCux67182.

Frequently asked questions

What is CVE-2015-6393?: Cisco NX-OS 4.1 through 7.3 and 11.0 through 11.2 on Nexus 2000, 3000, 3500, 5000, 5500, 5600, 6000, 7000, 7700, and 9000 devices allows remote attackers to cause a denial of service (device crash) via malformed IPv4 DHCP packets to the DHCPv4 relay agent, aka Bug IDs CSCuq39250, CSCus21733, CSCus21739, CSCut76171, and CSCux67182.
How severe is CVE-2015-6393?: CVE-2015-6393 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2015-6393 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6393?: CVE-2015-6393 primarily affects Cisco Nx-os. In total, 104 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-6393?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-6393 published?: CVE-2015-6393 was published on 2016-10-06 and last updated on 2026-06-17.

References

Affected products (104)

cpe:2.3:o:cisco:nx-os:4.2\(1\)n1\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:4.2\(1\)n2\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:4.2\(1\)n2\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(2\)n1\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(2\)n2\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(2\)n2\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(3\)n1\(1c\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(2b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.1\(3\)n1\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.1\(3\)n1\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.1\(3\)n2\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.1\(3\)n2\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.1\(3\)n2\(1b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.1\(3\)n2\(1c\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(1b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(5\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(6\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(7\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(8\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.2\(1\)n1\(8a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n1\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n1\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(1\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(1b\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(2\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(3\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(4\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(5\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(5a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:6.0\(2\)n2\(6\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:7.0\(0\)n1\(1\):*:*:*:*:*:*:*

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