CVE-2021-26993Network attack vector

Unauthenticated web-server service interruption

Published Jun 11, 2021 · Updated Aug 3, 2024

Denial of service in NetApp E-Series SANtricity OS Controller Software before 11.70.1 allows remote attackers to interrupt its web server. NetApp has not published the affected request handler, the triggering input, or the operation that makes the web server unavailable. No authentication or user interaction is required; the reported consequence is limited to partial web-server unavailability.

CVSS severity5.3
Medium
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in NetApp E-Series SANtricity OS Controller Software before 11.70.1 allows remote attackers to interrupt its web server. NetApp has not published the affected request handler, the triggering input, or the operation that makes the web server unavailable. No authentication or user interaction is required; the reported consequence is limited to partial web-server unavailability.

The record

CVE
CVE-2021-26993
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
NetApp
Product
E-Series SANtricity OS Controller Software
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 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 11.70.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NetApp · E-Series SANtricity OS Controller Softwareversion=Prior to 11.70.1

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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

T1499.004Application or System Exploitation

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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