`CVE-2021-2109` Oracle WebLogic Server

Affected software	Oracle WebLogic Server
Affected versions	10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0
Severity	7.2 High CVSS 3.1 2 scores
Fixed in	Oracle Critical Patch Update January 2021
Published	20 Jan 2021
Updated	13 Nov 2026

Description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Console). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0 and 14.1.1.0.0. Easily exploitable vulnerability allows high privileged attacker with network access via HTTP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.1 Base Score 7.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

CISA KEV not listed
VulnCheck KEV listed Exploitation reported in the wild. 1 citation · honeypot sightings · 3 exploits · earliest 2026-08-15.
CISA Vulnrichment exploitation: none
Indexed PoC 6 indexed Published artifacts you can open, in Exploit-DB, GitHub PoC; first seen 2021-01-22.
EPSS 71% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2021-2109 in VulnCheck (free account).

Evidence	Source	Detail	Date
Honeypot sighting	Shadowserver honeypots	Exploitation attempts seen on 10 days	2026-08-15 to 2026-09-05
Reported exploitation	previdian.com	/CVE-2021-2109	2026-08-15
Exploit reference	VulnCheck XDB 6bee2b5012f7	Exploit type: initial-access	2021-01-22
Exploit reference	VulnCheck XDB f8417315fb80	Exploit type: initial-access	2021-01-22
Exploit reference	VulnCheck XDB b4e76db595c7	Exploit type: initial-access	2021-05-13

Evidence

Source

Detail

Date

Honeypot sighting

Shadowserver honeypots

Exploitation attempts seen on 10 days

2026-08-15 to 2026-09-05

Reported exploitation

previdian.com

/CVE-2021-2109

2026-08-15

Exploit reference

VulnCheck XDB 6bee2b5012f7

Exploit type: initial-access

2021-01-22

Exploit reference

VulnCheck XDB f8417315fb80

Exploit type: initial-access

2021-01-22

Exploit reference

VulnCheck XDB b4e76db595c7

Exploit type: initial-access

2021-05-13

3 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	CVE-2021-2109 && Weblogic Server RCE via JNDI	31	2021-01-22
GitHub PoC	rabbitsafe/CVE-2021-2109	9	2021-01-22
GitHub PoC	weblogic CVE-2021-2109批量验证poc	4	2021-05-13
GitHub PoC	Oracle Weblogic RCE - CVE-2022-2109	3	2022-08-30
GitHub PoC	CVE-2021-2109 basic scanner		2021-08-09
Exploit-DB	Oracle WebLogic Server 14.1.1.0 - RCE (Authenticated)		2021-01-22

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Protection full Improper input validation
Action available security rule
Review human ARMR file
Record active

Decided by	An ARMR security-rule template on disk for this CVE
Finding	A shipped ARMR security rule mitigates this CVE: CVE-2021-2109.armr.

Decided by

An ARMR security-rule template on disk for this CVE

Finding

A shipped ARMR security rule mitigates this CVE: CVE-2021-2109.armr.

ARMR rule files

1 file

The rule files Waratek ships for this CVE. Some CVEs need more than one, for example one per affected library or one per ARMR version.

CVE-2021-2109.armr security rule added 2022-09-21 updated 2022-09-26

Waratek research note

written 2026-11-13

Written by a Waratek engineer who reviewed this CVE. Their decision sets the status above, ahead of every automated rule except a withdrawal.

Comments

Rule Name: HTTP Input Validation

How to mitigate CVE-2021-2109

Apply the fix in Oracle Critical Patch Update January 2021. Until you can, Waratek RASP blocks exploitation with its improper input validation rule. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

CVSS

7.2 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 7.2 HIGH CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H secalert_us@oracle.com Secondary published

CVSS 2.0 6.5 none AV:N/AC:L/Au:S/C:P/I:P/A:P NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	7.2	HIGH	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`	secalert_us@oracle.com	Secondary	published
CVSS 2.0	6.5	none	`AV:N/AC:L/Au:S/C:P/I:P/A:P`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update January 2021 ↗	CPU	2021-Q1	Oracle Fusion Middleware / Console (10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0)

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update January 2021 ↗

CPU

2021-Q1

Oracle Fusion Middleware / Console (10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0)

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Fusion Middleware	Console	10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0	10.3.6.0.0 · 12.1.3.0.0 · 12.2.1.3.0 · 12.2.1.4.0 · 14.1.1.0.0

Family

Component

Versions, as Oracle lists them

Read as

Oracle Fusion Middleware

Console

10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0

10.3.6.0.0 · 12.1.3.0.0 · 12.2.1.3.0 · 12.2.1.4.0 · 14.1.1.0.0

Products and versions

1 product, 5 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	oracle	weblogic server	generic	10.3.6.0.0 · 12.1.3.0.0 · 12.2.1.3.0 · 12.2.1.4.0 · 14.1.1.0.0

Source

Vendor

Product

Scheme

Affected versions

nvd

oracle

weblogic server

generic

10.3.6.0.0 · 12.1.3.0.0 · 12.2.1.3.0 · 12.2.1.4.0 · 14.1.1.0.0

References

URL	Tags
http://packetstormsecurity.com/files/161053/Oracle-WebLogic-Server-14.1.1.0-Remote-Code-Execution.html	Exploit, Third Party Advisory, VDB Entry
https://www.oracle.com/security-alerts/cpujan2021.html	Vendor Advisory

URL

Timeline

Published	2021-01-20	By the CVE Program.
ARMR remediation created	2022-09-21	Earliest commit adding this CVE's ARMR patch or security rule.
ARMR remediation last updated	2022-09-26	Most recent commit touching this CVE's ARMR patch or security rule.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.
VulnCheck KEV: earliest evidence	2026-08-15	Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
VulnCheck KEV: latest evidence	2026-09-05	Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.
Classification created	2026-11-13	First commit adding this CVE's research note.
Last VRT activity	2026-11-13	Most recent commit touching this CVE's classification, patch or rule file.

Published

2021-01-20

By the CVE Program.

ARMR remediation created

2022-09-21

Earliest commit adding this CVE's ARMR patch or security rule.

ARMR remediation last updated

2022-09-26

Most recent commit touching this CVE's ARMR patch or security rule.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

VulnCheck KEV: earliest evidence

2026-08-15

Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.

VulnCheck KEV: latest evidence

2026-09-05

Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.

Classification created

2026-11-13

First commit adding this CVE's research note.

Last VRT activity

2026-11-13

Most recent commit touching this CVE's classification, patch or rule file.

How VRT decided (3 of 24 rules ran)

3 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file decided it matched Protected by Waratek Shipped ARMR security rule exists: CVE-2021-2109.armr

4 manual-classification not reached A researcher's recorded decision for this specific CVE

5 manual classification not reached Manual classification of this CVE in the legacy dataset

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

NVD ↗ · CVE.org ↗