What is the CVSS score of EUVD-2026-62170?

EUVD-2026-62170 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.4%.

Which versions of Oracle Helidon are affected by EUVD-2026-62170?

Oracle Helidon 3.2.20 contains a denial-of-service vulnerability enabling unauthenticated remote attackers to crash or hang web servers, creating immediate risk to service availability for all…

How to fix or mitigate EUVD-2026-62170?

Within 24 hours: inventory all systems running Oracle Helidon 3.2.20 and identify any that are publicly accessible; deploy rate limiting and request filtering at the network perimeter to block malformed HTTP requests. Within 7 days: implement WAF rules to validate inbound HTTP requests, enable comprehensive monitoring and alerting for server crashes and indefinite hangs, and contact Oracle to establish an upgrade timeline for Helidon beyond version 3.2.20. Within 30 days: upgrade all affected systems to a patched Helidon version or deploy reverse-proxy solutions (such as nginx or HAProxy) with enhanced request validation, conduct full regression testing, and verify system stability under normal and peak loads.

Oracle Helidon EUVD-2026-62170

| CVE-2026-73927 HIGH

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-q5p2-4pv3-vrgc

Oracle Authentication Bypass Helidon

7.5

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

7.5 HIGH

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

vuln.today AI

7.5 HIGH

HTTP-based DoS with no authentication or user interaction required; impact is solely availability with no confidentiality or integrity effect, consistent with vendor description.

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

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Aug 18, 2026 - 21:57 vuln.today

CVE Published

Aug 18, 2026 - 21:18 nvd

HIGH 7.5

DescriptionCVE.org

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.20. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

AnalysisAI

Denial-of-service in Oracle Helidon 3.2.20 (Imperative Web Server component) allows unauthenticated remote attackers to repeatedly crash or indefinitely hang the server via crafted HTTP requests. The vulnerability is rated CVSS 7.5 with no authentication, no user interaction, and low attack complexity, making it trivially exploitable at scale against any exposed instance. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Identify exposed Helidon HTTP endpoint

Delivery

Send crafted HTTP request to Imperative Web Server

Exploit

Trigger hang or crash in request processing

Execution

Service becomes unavailable

Impact

Repeat to sustain outage

Access

Identify exposed Helidon HTTP endpoint

Delivery

Send crafted HTTP request to Imperative Web Server

Exploit

Trigger hang or crash in request processing

Execution

Service becomes unavailable

Impact

Repeat to sustain outage

Vulnerability AssessmentAI

Exploitation	No special conditions are required for the attack vector itself - exploitation is remote, unauthenticated, and low-complexity against any Helidon 3.2.20 instance running the Imperative Web Server component with HTTP exposed to the network (AV:N/AC:L/PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 7.5 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects a straightforwardly dangerous denial-of-service: remote, unauthenticated, low-complexity, and fully automatable, meaning a single malicious actor or botnet could repeatedly knock Helidon services offline. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated attacker on the internet sends a sequence of specially crafted HTTP requests to a publicly exposed Helidon 3.2.20 Imperative Web Server endpoint. The server enters a hang state or crashes, causing a complete service outage. …
Remediation	Apply the patch issued by Oracle in the Critical Patch Update (CPU) for August 2026, available via the advisory at https://www.oracle.com/security-alerts/cspuaug2026.html. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: inventory all systems running Oracle Helidon 3.2.20 and identify any that are publicly accessible; deploy rate limiting and request filtering at the network perimeter to block malformed HTTP requests. …

Threat intelligence, references, and detailed analysis are available after sign-in.