CVE-2026-83021: Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Container)

This month

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2026-83021 is a critical-severity flaw (CVSS 10.0) affecting weblogic server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Container). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle WebLogic Server. While the vulnerability is in Oracle WebLogic Server, attacks may significantly impact additional products (scope change). Suc

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-287, CWE-306
Published	2026-09-15
Last modified	2026-09-28

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-15 20:18 UTCPublished CVE record published
2026-09-28 15:14 UTCUpdated Record last modified

oracle weblogic server DOWNGRADE

Affected: 12.2.1.4.0 · 14.1.1.0.0 · 14.1.2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.2.1.4.0

1. Check installed version

apt-cache policy weblogic-server || rpm -q weblogic-server || weblogic-server --version

2. No fixed release: DOWNGRADE to a release before 12.2.1.4.0 (Debian / Ubuntu)

apt-cache madison weblogic-server sudo apt install weblogic-server=<VERSION_BEFORE_12.2.1.4.0> sudo apt-mark hold weblogic-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list weblogic-server sudo dnf downgrade weblogic-server-<VERSION_BEFORE_12.2.1.4.0> sudo dnf versionlock add weblogic-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-83021?

weblogic server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-83021 being exploited?

CVE-2026-83021 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-2026-83021 affect?

CVE-2026-83021 affects weblogic server. Severity is critical (CVSS 10.0). Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Container). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenti

How urgent is CVE-2026-83021?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Oracle WebLogic vulnerabilities

Related CVEs

CVE-2026-34305 HIGH 7.5 DOWNGRADE Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Services)
CVE-2026-34292 HIGH 7.2 DOWNGRADE Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)
CVE-2026-34315 MEDIUM 6.5 DOWNGRADE Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Services)
CVE-2026-35300 CRITICAL 9.8 DOWNGRADE Vulnerability in the WebLogic Server product of Oracle Fusion Middleware (component: Core)
CVE-2026-35292 CRITICAL 10.0 DOWNGRADE Vulnerability in the WebLogic Server product of Oracle Fusion Middleware (component: Console)

References

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