CVE-2021-1999

Local high-privilege modification of critical data

Published Jan 20, 2021 · Updated Sep 26, 2024

Integrity flaw in Oracle ZFS Storage Appliance Kit 8.8 allows local users to create, delete, or modify critical accessible data. Oracle identifies the RAS subsystems but has not published the flawed operation or input path. Exploitation requires high privileges on the appliance and interaction by another person; success changes critical data without disclosing or interrupting it.

CVSS severity5.0
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integrity flaw in Oracle ZFS Storage Appliance Kit 8.8 allows local users to create, delete, or modify critical accessible data. Oracle identifies the RAS subsystems but has not published the flawed operation or input path. Exploitation requires high privileges on the appliance and interaction by another person; success changes critical data without disclosing or interrupting it.

The record

CVE
CVE-2021-1999
Published
Jan 20, 2021
Updated
Sep 26, 2024
Vendor
Oracle
Product
Oracle ZFS Storage Appliance Kit
Classifications
T1565
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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=8.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Oracle · Oracle ZFS Storage Appliance Kitversion=8.8

Published CVSS scores

5.0OracleCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:N

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.

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No observations available

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

Weakness, pattern, technique

T1565Data 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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