CVE-2021-26989: Clustered Data ONTAP versions prior to 9.3P21, 9.5P16, 9.6P12, 9.7P9 and 9.8 are susceptible to a vulnerabilit

This month

MEDIUM 6.5MITIGATE

CVE-2021-26989 is a medium-severity flaw (CVSS 6.5) affecting data ontap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Clustered Data ONTAP versions prior to 9.3P21, 9.5P16, 9.6P12, 9.7P9 and 9.8 are susceptible to a vulnerability which could allow a remote authenticated attacker to cause a Denial of Service (DoS) on clustered Data ONTAP configured for SMB access.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Published	2021-03-04
Last modified	2026-06-17

Publisher (CNA): NetApp, Inc. · Vendor: netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-04 21:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

netapp data ontap MITIGATE

Affected: 9.3.0 · 9.3.0 p1 · 9.3.0 p10 · 9.3.0 p11 · 9.3.0 p12 · 9.3.0 p13 · 9.3.0 p14 · 9.3.0 p15

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-26989?

data ontap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-26989 being exploited?

CVE-2021-26989 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-26989 affect?

CVE-2021-26989 affects data ontap. Severity is medium (CVSS 6.5). Clustered Data ONTAP versions prior to 9.3P21, 9.5P16, 9.6P12, 9.7P9 and 9.8 are susceptible to a vulnerability which could allow a remote authenticated attacker to cause a Denial of Service (DoS) on clustered Data ONTAP configured for SMB

How urgent is CVE-2021-26989?

Priority 40/100. No elevated risk signals yet.

Related CVEs

CVE-2021-26988 LOW 3.5 MITIGATE Clustered Data ONTAP versions prior to 9.3P21, 9.5P16, 9.6P12, 9.7P8 and 9.8 are susceptible to a vulnerabilit
CVE-2020-13817 HIGH 7.4 UPGRADE MITIGATE ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (dae
CVE-2020-11868 HIGH 7.5 UPGRADE MITIGATE ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated sync
CVE-2019-8936 HIGH 7.5 UPGRADE MITIGATE NTP through 4.2.8p12 has a NULL Pointer Dereference.
CVE-2019-5502 CRITICAL 9.1 UPGRADE SMB in Data ONTAP operating in 7-Mode versions prior to 8.2.5P3 has weak cryptography which when exploited cou

References

← Back to latest CVEs