CVE-2021-35587: Oracle Fusion Middleware exploited

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

What it is

Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: OpenSSO Agent). Supported versions that are affected are 11.1.2.3.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Access Manager. Successful attacks of this vulnerability can result in takeover of Oracle Access Manager. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Description quoted from the CVE record (assigned by oracle, published 2022-01-19).

Weakness: CWE-306 Missing Authentication for Critical Function

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since: 2022-11-28
US federal deadline: 2022-12-19
Ransomware use: Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2022-01248, CNNVD-202201-1433, CNVD-2022-52565, EUVD-2021-22223, GHSA-x3jv-936g-xqj4

VEDAS cluster: VEDAS:BRILLIANCERAM

Exploit Observer links 10 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (10)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Metasploit module: https://www.rapid7.com/db/modules/exploit/multi/http/oracle_access_manager_rce_cve_2021_35587/
Nuclei template: https://raw.githubusercontent.com/projectdiscovery/nuclei-templates/main/http/cves/2021/CVE-2021-35587.yaml
Code repository: https://github.com/1s1ldur/cve-2021-35587-vulnerability-check
Code repository: https://github.com/antx-code/cve-2021-35587
Code repository: https://github.com/zz-socmap/cve-2021-35587
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/nuclei/2021/CVE-2021-35587.yaml
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/nuclei/2021/CVE-2021-35587.yaml
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2021/CVE-2021-35587.rules
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2021/CVE-2021-35587.rules
Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2021/CVE-2021-35587.rules

Vulnerability databases and vendor advisories (7)

Catalogue entries, not exploit evidence.

Vulnerability database or vendor advisory: https://access.redhat.com/security/cve/cve-2021-35587
Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2021-22223
Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-x3jv-936g-xqj4
Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-35587
Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35587
Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202201-1433
Vulnerability database or vendor advisory: https://www.cnvd.org.cn/flaw/show/CNVD-2022-52565

276 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS: 0.963
very likely to be attacked soon
VEDAS: 0.981
strong exploit evidence
On CISA KEV: Yes, since 2022-11-28
Detection rule: Nuclei · Suricata

EPSS (chance of attack)

VEDAS (exploit evidence)

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.

Who is affected

Product	Affected	Not affected
Oracle Corporation Access Manager	version 11.1.2.3.0 version 12.2.1.3.0 version 12.2.1.4.0	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: oracle access_manager, oracle_corp. oracle_access_manager.

How to fix it

CISA required action: Apply updates per vendor instructions.

Vendor guidance:

How to detect it

Nuclei template (active check)

Oam - Insecure Deserialization
Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: OpenSSO Agent). Supported versions that are affected are 11.1.2.3.0, 12.2.1.3.0 and 12.2.1.4.0.

Name and description quoted from the template, written by VEDAS.

The template sends 1 request (GET /oam/server/opensso/sessionservice); it decides using status, word matchers. Severity in the template: critical. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2021-35587.yaml

Show the template (43 lines)

yaml

id: CVE-2021-35587

info:
  name: "Oam - Insecure Deserialization"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: OpenSSO Agent).
    Supported versions that are affected are 11.1.2.3.0, 12.2.1.3.0 and 12.2.1.4.0.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2021-35587&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=oam&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-35587
    cwe-id: CWE-502
  metadata:
    verified: false
  tags: cve2021,cve,oam,rce,java,unauth,oracle,kev,vkev,vuln
http:
  - method: GET
    path:
      - '{{BaseURL}}/oam/server/opensso/sessionservice'

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "x-oracle-dms-ecid"
          - "x-oracle-dms-rid"
        case-insensitive: true
        condition: or

      - type: word
        part: body
        words:
          - "/oam/pages/css/general.css"

      - type: status
        status:
          - 200

CVE-2021-35587.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2021-35587 Oam - Insecure Deserialization. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2021-35587 Oam - Insecure Deserialization"; flow:established,to_server; http.uri; content:"sessionservice"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2021-35587; reference:url,https://www.exploit.observer/?keyword=CVE-2021-35587&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=oam&match=exact; sid:1010870; rev:1;)

CVE-2021-35587.rules on GitHub

Advisories on this CVE

Oracle Cloud login service breach (March 2025)

References

Government sources

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35587 (government-resource)

Other references

https://www.oracle.com/security-alerts/cpujan2022.html (x_refsource_MISC)

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.