Threats / Oracle / CVE-2021-35587
CVE-2021-35587
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Oracle Fusion Middleware vulnerability
Oracle Fusion Middleware Access Manager allows unauthenticated network attackers to take over the product via HTTP, exploiting unsafe deserialization and other weaknesses.
Verdict
Today item — known-exploited.
An unauthenticated remote attacker can compromise Access Manager without credentials, leading to complete system takeover. The high EPSS score and active exploitation indicate immediate risk to deployed instances.
CISA KEV Yes · 2022-11-285EPSS 0.96284 (verify live)6CVSS 9.83CISA SSVC Exploitation: active · Automatable: yes · Impact: total4Exploit Weaponized · public exploit · Metasploit module · nuclei template13
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
669 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-11-28).
Probability (EPSS)
EPSS 0.96284 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) · Affected: Oracle, Fusion Middleware. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-502 Deserialization of Untrusted Data, CWE-790 CWE-790 — weakness family: Injection.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 313 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
Public exploit available
Public exploit tooling is catalogued for this CVE (a functional/weaponized public exploit). Catalog entries: Metasploit module, nuclei template. We link the catalog page(s) only — no payload or code is hosted or restated here.Link, never host — the catalog page is the source; basicsecurity.net does not redistribute payloads.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I send a crafted HTTP request containing malicious serialized objects to the Access Manager endpoint.
Business
The authentication and authorization layer protecting all downstream applications is compromised, enabling unauthorized access to sensitive systems.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit unsafe deserialization to execute arbitrary code on the Access Manager server.
Business
Attackers gain full control of the identity and access management infrastructure, potentially affecting all integrated enterprise applications.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistence and move laterally through the network using compromised Access Manager credentials and tokens.
Business
The breach expands across the organization, compromising multiple systems and enabling data exfiltration at scale.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05