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Fencer Intel
high 7.8

CVE-2019-1593 json

Cisco NX-OS Software Bash Shell Role-Based Access Control Bypass Privilege Escalation Vulnerability

published 7y ago modified 4mo ago also EUVD-2019-10150

cvss
7.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to escalate their privilege level by executing commands authorized to other user roles. The attacker must authenticate with valid user credentials. The vulnerability is due to the incorrect implementation of a Bash shell command that allows role-based access control (RBAC) to be bypassed. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Bash prompt. A successful exploit could allow the attacker to escalate their privilege level by executing commands that should be restricted to other roles. For example, a dev-ops user could escalate their privilege level to admin with a successful exploit of this vulnerability.

Patch / fix

  • Cisco Nexus 3000 Series Switches 7.0(3)I7(4)
  • Cisco Nexus 3500 Platform Switches 7.0(3)I7(4)
  • Cisco Nexus 3600 Platform Switches 7.0(3)F3(5)
  • Cisco Nexus 7000 and 7700 Series Switches 8.2(3)
  • Cisco Nexus 9000 Series Fabric Switches in ACI Mode 13.2(4d), 14.0(1h)
  • Cisco Nexus 9000 Series Switches in Standalone NX-OS Mode 7.0(3)I4(9), 7.0(3)I7(4)

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3500 Platform Switches
  • Cisco Nexus 3600 Platform Switches
  • Cisco Nexus 7000 and 7700 Series Switches
  • Cisco Nexus 9000 Series Fabric Switches in ACI Mode
  • Cisco Nexus 9000 Series Switches in Standalone NX-OS Mode

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.