CVE-2021-26990Network attack vector

Unauthenticated system file overwrite

Published Mar 19, 2021 · Updated Aug 3, 2024

Arbitrary file overwrite in NetApp Cloud Manager before 3.9.4 allows remote attackers to replace system files through network requests. NetApp has not published the affected component or the operation that accepts attacker-controlled file paths or content. No authentication or user interaction is required, and successful exploitation can alter system files and interrupt the service.

CVSS severity9.1
Critical
EPSS probability1.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file overwrite in NetApp Cloud Manager before 3.9.4 allows remote attackers to replace system files through network requests. NetApp has not published the affected component or the operation that accepts attacker-controlled file paths or content. No authentication or user interaction is required, and successful exploitation can alter system files and interrupt the service.

The record

CVE
CVE-2021-26990
Published
Mar 19, 2021
Updated
Aug 3, 2024
Vendor
NetApp
Product
Cloud Manager
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 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=Prior to 3.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NetApp · Cloud Managerversion=Prior to 3.9.4

Published CVSS scores

9.4NIST NVDAV:N/AC:L/Au:N/C:N/I:C/A:C
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

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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