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CVE-2019-1599

34
FAUCET Score

CVE-2019-1599 is a denial-of-service vulnerability in the network stack of Cisco NX-OS Software, affecting numerous Cisco Nexus switch and UCS Fabric Interconnect product lines. An unauthenticated, remote attacker can exploit this by sending sustained, crafted TCP streams directly to an affected device, causing it to run out of memory buffers. This vulnerability has a CVSS score of 8.6 (High), indicating a severe impact on availability with low attack complexity. There is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
>= 9.2, < 9.2\(2\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
>= 7.0\(3\), < 7.0\(3\)i7\(5\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
>= 7.0\(3\), < 7.0\(3\)f3\(5\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
>= 7.2, < 7.3\(5\)n1\(1\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*
>= 8.3, < 8.3\(2\)CPE matchmatch criteria
cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.6HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
14.28%
Probability of exploitation in next 30 days
EPSS Percentile
96.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1428 is in the 94th percentile among its peer group of 51,551 CVEs.

Social Chatter

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

Patch Available

Vendor Patches (1)

ciscopatch availablevia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-netstack
PatchVendor Advisory
securityfocus.com / bid/107342
Third Party AdvisoryVDB Entry