Security readout for executives and security teams
Plain-English summary
CVE-2021-35587 is a critical Oracle Access Manager flaw that can let an unauthenticated network attacker take over the product through HTTP. For organizations using affected versions, this is high business risk because Access Manager often protects identity and application access.
Executive priority
Treat this as urgent for any affected Oracle Access Manager environment. Because KEV confirms exploitation and successful attack can mean product takeover, remediation should be prioritized ahead of routine patching, especially for externally reachable identity infrastructure.
Technical view
Oracle describes this as an easily exploitable OpenSSO Agent vulnerability in Access Manager. A remote unauthenticated attacker with HTTP access can compromise Oracle Access Manager. The CVSS 3.1 score is 9.8 with high confidentiality, integrity, and availability impact. The mapped weakness is CWE-306.
Likely exposure
Exposure is likely where Oracle Access Manager versions 11.1.2.3.0, 12.2.1.3.0, or 12.2.1.4.0 are deployed and reachable over HTTP. Internet-facing, partner-facing, or broadly internal deployments should be treated as highest priority.
Exploitation context
CISA KEV status indicates known exploitation. The provided sources do not include exploit mechanics, indicators, campaign details, or affected deployment patterns beyond Oracle Access Manager OpenSSO Agent and the listed versions.
Researcher notes
Evidence is strong for severity, affected versions, unauthenticated HTTP attack surface, and exploitation status. Public source detail is limited on root cause, exploit prerequisites beyond network HTTP access, indicators, and exact fixed builds, so validation should rely on Oracle advisory data and local version evidence.
Mitigation direction
- Apply Oracle January 2022 CPU guidance or later applicable Oracle Access Manager updates.
- Restrict HTTP network access to Oracle Access Manager until remediation is confirmed.
- Prioritize remediation for internet-facing or broadly reachable Access Manager deployments.
- Review Oracle and CISA guidance for any newer vendor instructions.
- Increase monitoring around Access Manager authentication and administrative activity.
Validation and detection
- Inventory Oracle Access Manager deployments and confirm installed versions.
- Determine whether the OpenSSO Agent component is present or enabled.
- Check whether Access Manager is reachable over HTTP from untrusted networks.
- Verify patch status against Oracle January 2022 CPU guidance.
- Review logs for unusual unauthenticated access or administrative changes.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-35587 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/security-alerts/cpujan2022.htmlCVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35587CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.