CVE-2023-20040

mediumpriority · track · 22EPSS 0.012 · 69 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.24% (69th) EPSS

CVSS 5.5 · medium

Is it mine?

12 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the NETCONF service of Cisco Network Services Orchestrator (NSO) could allow an authenticated, remote attacker to cause a denial of service (DoS) on an affected system that is running as the root user. To exploit this vulnerability, the attacker must be a member of the admin group. This vulnerability exists because user-supplied input is not properly validated when NETCONF is used to upload packages to an affected device. An attacker could exploit this vulnerability by uploading a specially crafted package file. A successful exploit could allow the attacker to write crafted files to arbitrary locations on the filesystem or delete arbitrary files from the filesystem of an affected device, resulting in a DoS condition. Note: By default, during install, Cisco NSO will be set up to run as the root user unless the --run-as-user option is used.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Network Services Orchestratorcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

5.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Hprimary · NVD / NIST USexploitability 1.2 · impact 4.2

v3.15.5mediumAV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Hsecondary · FSTEC (BDU) RU

v3.15.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Hsecondary · ENISA EU

v3.15.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Hsecondary · psirt@cisco.com USexploitability 1.2 · impact 4.2

v3.15.1mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.15.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:Hsecondary · Cisco PSIRT US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-434USprimaryCWE-22USCWE-23US

affected products (12)

Products and version ranges known to be affected.

Cisco Cisco Network Services Orchestratorall versionscisco_csafUS
Cisco Cisco Network Services Orchestrator≤ 4.7.3enisa_euvdEU
Cisco Systems Inc. Network Services Orchestrator3.3 → 5.4.7fstec_bduRU
Cisco Systems Inc. Network Services Orchestrator5,8 → 5.8.1fstec_bduRU
Cisco Systems Inc. Network Services Orchestrator5.5 → 5.5.6fstec_bduRU
Cisco Systems Inc. Network Services Orchestrator5.6 → 5.6.7fstec_bduRU
Cisco Systems Inc. Network Services Orchestrator5.7 → 5.7.4fstec_bduRU
cisco network services orchestrator3.3 → 5.4.7nvdUScpe:2.3:a:cisco:network_services_orchestrator:*:*:*:*:*:*:*:*
cisco network services orchestrator5.5 → 5.5.6nvdUScpe:2.3:a:cisco:network_services_orchestrator:*:*:*:*:*:*:*:*
cisco network services orchestrator5.6 → 5.6.7nvdUScpe:2.3:a:cisco:network_services_orchestrator:*:*:*:*:*:*:*:*
cisco network services orchestrator5.7 → 5.7.4nvdUScpe:2.3:a:cisco:network_services_orchestrator:*:*:*:*:*:*:*:*
cisco network services orchestrator= 5.8nvdUScpe:2.3:a:cisco:network_services_orchestrator:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0074Cisco Network Services Orchestrator: Schwachstelle ermöglicht Manipulation von Dateien und Denial of ServiceDeutsch2023-01-11csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Cisco Network Services Orchestrator ausnutzen, um Dateien zu manipulieren und einen Denial of Service Zustand zu verursachen.
cisco-sa-nso-path-trvsl-zjBeMkZgCisco Network Services Orchestrator Path Traversal Vulnerability2023-01-11csaf · cisco_csafUS
A vulnerability in the RESTCONF and NETCONF services of Cisco Network Services Orchestrator (NSO) could allow an authenticated, remote attacker to cause a denial of service (DoS) on an affected system that is running as the root user. To exploit this vulnerability, the attacker must be a member of the admin group. This vulnerability exists because user-supplied input is not properly validated when either RESTCONF or NETCONF is used to upload packages to an affected device. An attacker could exploit this vulnerability by uploading a specially crafted package file. A successful exploit could allow the attacker to write crafted files to arbitrary locations on the filesystem or delete arbitrary files from the filesystem of an affected device, resulting in a DoS condition. Note: By default, during install, Cisco NSO will be set up to run as the root user unless the --run-as-user option is used. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd cert_bund NVD CVE.org MITRE

published 2023-01-20modified 2026-06-17

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references (5)

External citations — patches, advisories, analysis.

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