CVE-2021-27276Network attack vector

DoS via unvalidated file path

Published Mar 29, 2021 · Updated Aug 3, 2024

Path traversal in NETGEAR ProSAFE Network Management System NMS300 1.6.0.26 allows remote attackers to delete arbitrary files via crafted realName requests. The MibController class uses the user-supplied realName path in file operations without proper validation, permitting traversal outside intended directories. Authentication is nominally required but bypassable; successful requests can remove files and interrupt NMS300 service availability without demonstrated confidentiality impact.

CVSS severity7.1
High
EPSS probability72.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in NETGEAR ProSAFE Network Management System NMS300 1.6.0.26 allows remote attackers to delete arbitrary files via crafted realName requests. The MibController class uses the user-supplied realName path in file operations without proper validation, permitting traversal outside intended directories. Authentication is nominally required but bypassable; successful requests can remove files and interrupt NMS300 service availability without demonstrated confidentiality impact.

The record

CVE
CVE-2021-27276
Published
Mar 29, 2021
Updated
Aug 3, 2024
Vendor
NETGEAR
Product
ProSAFE Network Management System NMS300
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.6.0.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NETGEAR · ProSAFE Network Management System NMS300version=1.6.0.26

Published CVSS scores

7.1Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
5.5NVDAV:N/AC:L/Au:S/C:N/I:P/A:P
7.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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