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CVE-2019-1601

Cisco NX-OS Software Unauthorized Filesystem Access Vulnerability

HIGH
7.8
CVSS Score
Published: March 8, 2019 at 06:00 PM UTC
Updated: June 17, 2026 at 02:28 AM UTC
13 products affected across 1 vendorNx OSNexus 7000Nexus 7700

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Severity
HIGH7.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A vulnerability in the filesystem permissions of Cisco NX-OS Software could allow an authenticated, local attacker to gain read and write access to a critical configuration file. The vulnerability is due to a failure to impose strict filesystem permissions on the targeted device. An attacker could exploit this vulnerability by accessing and modifying restricted files. A successful exploit could allow an attacker to use the content of this configuration file to bypass authentication and log in as any user of the device. MDS 9000 Series Multilayer Switches are affected in versions prior to 6.2(25), 8.1(1b), and 8.3(1). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 3500 Platform Switches are affected in versions prior to 6.0(2)A8(10) and 7.0(3)I7(4). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.1(5)N1(1b) and 7.3(3)N1(1). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(22), 7.3(3)D1(1), and 8.2(3). Nexus 9000 Series Switches-Standalone are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS· Cisconpm
95%
v < 6.0(2)a8(10)v < 6.2(22)v < 6.2(25)v < 7.0(3)i4(9)v < 7.1(5)n1(1b)7.0(3) ≤ v < 7.0(3)i7(4)7.0(3)f1 ≤ v < 7.0(3)f3(5)7.0(3)f3 ≤ v < 7.0(3)f3(5)7.0(3)i5 ≤ v < 7.0(3)i7(4)7.2 ≤ v < 7.3(3)d1(1)7.2 ≤ v < 7.3(3)n1(1)7.3 ≤ v < 8.1(1b)8.0 ≤ v < 8.1(2)8.2 ≤ v < 8.3(1)
Affected range stops below 6.0(2)a8(10), so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2(22), so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2(25), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0(3)f3(5), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0(3)i4(9), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0(3)i7(4), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.1(5)n1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)d1(1), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)n1(1), so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1(2), so it looks safe — our inference, not a vendor statement
Affected range stops below 8.3(1), so it looks safe — our inference, not a vendor statement
cisco-mds-9000 (environment) · cisco-nexus-2000 (environment) · cisco-nexus-3000 (environment) · cisco-nexus-3500 (environment) · cisco-nexus-3600 (environment) · cisco-nexus-5500 (environment) · cisco-nexus-5600 (environment) · cisco-nexus-6000 (environment) · cisco-nexus-7000 (environment) · cisco-nexus-7700 (environment) · cisco-nexus-9000 (environment) · cisco-nexus-9500 (environment)
Mds 9000· Cisco
60%
v < 6.2(25)v < 8.1(1b)v < 8.3(1)
Affected range stops below 6.2(25), so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 8.3(1), so it looks safe — our inference, not a vendor statement
Nexus 2000· Cisco
60%
v < 7.1(5)N1(1b)v < 7.3(3)N1(1)
Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)N1(1), so it looks safe — our inference, not a vendor statement
Nexus 3000· Cisco
60%
v < 7.0(3)I4(9)v < 7.0(3)I7(4)
Affected range stops below 7.0(3)I4(9), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0(3)I7(4), so it looks safe — our inference, not a vendor statement
Nexus 3500· Cisco
60%
v < 6.0(2)A8(10)v < 7.0(3)I7(4)
Affected range stops below 6.0(2)A8(10), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0(3)I7(4), so it looks safe — our inference, not a vendor statement
Nexus 3600· Cisco
60%
v < 7.0(3)F3(5)
Affected range stops below 7.0(3)F3(5), so it looks safe — our inference, not a vendor statement
Nexus 5500· Cisco
60%
v < 7.1(5)N1(1b)v < 7.3(3)N1(1)
Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)N1(1), so it looks safe — our inference, not a vendor statement
Nexus 5600· Cisco
60%
v < 7.1(5)N1(1b)v < 7.3(3)N1(1)
Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)N1(1), so it looks safe — our inference, not a vendor statement
Nexus 6000· Cisco
60%
v < 7.1(5)N1(1b)v < 7.3(3)N1(1)
Affected range stops below 7.1(5)N1(1b), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)N1(1), so it looks safe — our inference, not a vendor statement
Nexus 7000· Cisco
60%
v < 6.2(22)v < 7.3(3)D1(1)v < 8.2(3)
Affected range stops below 6.2(22), so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3(3)D1(1), so it looks safe — our inference, not a vendor statement
Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

VDB Entryx_refsource_BIDThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/107404
Vendor Advisoryx_refsource_CISCOPatch
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-file-access

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284CWE-732

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