NVD / CVE Program· CNA oracle

CVE-2023-21839: Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core).

Noroxi assessment

Priority: Now (action score 90/100)

CISA has confirmed exploitation in the wild (May 1, 2023). Remediation deadline for US federal agencies: May 22, 2023.
A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 99.9% (FIRST EPSS); higher than 99.9% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.3.0, 12.2.1.4.0 and 14.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle WebLogic Server accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

HighCVSS 7.5 · v3.1KEVWeaponized No fix recorded

BDU:2023-00573

Published: Jan 17, 2023
Updated: Jun 17, 2026
EPSS: 99.9% · 99th percentile
CWE: CWE-502

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 30 / 30 · 99.9%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · oracle: 7.5; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on May 1, 2023. That signals real attacks, not theory.

Remediation deadline for US federal agencies: May 22, 2023.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
oracle	weblogic server	cpe:2.3:a:oracle:weblogic_server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

oracle weblogic server12.2.1.3.0
oracle weblogic server12.2.1.4.0
oracle weblogic server14.1.1.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (oracle). Independent of NVD's CPE analysis and usually ahead of it.

Oracle Corporation WebLogic Server
- 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0affected

Same product

oracle: all records

Other highest-scoring records for the same primary product.

CVE-2020-14750Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Console).KEV
99Now
CVE-2020-14882Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Console).KEV
99Now
CVE-2018-2628Vulnerability in the Oracle WebLogic Server component of Oracle Fusion Middleware (subcomponent: WLS Core Components).KEV
99Now

Published before and after this one in the same product

← EarlierCVE-2023-21837Jan 17, 2023 · Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core).
30Monitor
← EarlierCVE-2023-21838Jan 17, 2023 · Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core).
30Monitor
Later →CVE-2023-21841Jan 17, 2023 · Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core).
30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Metasploit module ×1
Nuclei detection template ×1
Proof-of-concept repository on GitHub ×8

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Metasploit module	exploit/multi/iiop/cve_2023_21839_weblogic_rceOracle Weblogic PreAuth Remote Command Execution via ForeignOpaqueReference IIOP Deserializationexploit	2023-01-17
Nuclei detection template	Nuclei template CVE-2023-21839	—
Proof-of-concept repository on GitHub	stars:242	2023-02-21
Proof-of-concept repository on GitHub	stars:118	2023-02-24
Proof-of-concept repository on GitHub	stars:26	2023-03-11
Proof-of-concept repository on GitHub	stars:19	2023-04-15
Proof-of-concept repository on GitHub	stars:0	2023-05-29
Proof-of-concept repository on GitHub	stars:2	2023-12-03
Proof-of-concept repository on GitHub	stars:61	2024-02-06
Proof-of-concept repository on GitHub	stars:3	2026-06-02

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

MetasploitJan 17, 2023-1 d
PublishedJan 17, 2023
First PoCFeb 21, 2023+34 d
CISA KEVMay 1, 2023+103 d
TodayNov 3, 2026+1386 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-23-0031 · Jan 18, 2023(Oracle WebLogic Server Zafiyeti)

All national notices →

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: none
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-502 · Deserialization of Untrusted Data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-secondary

Root cause

Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.

The bug in code

The whole CWE-502 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

python

1payload = sock.recv(65536)
2job = pickle.loads(payload)

Fixed

python

1payload = sock.recv(65536)
2if not hmac.compare_digest(sign(payload), header_sig):
3    raise PermissionError("invalid signature")
4job = JobSchema.validate(json.loads(payload))