CVE-2020-15386Network attack vector

Service degradation via scan-induced high CPU load

Published Jun 9, 2021 · Updated Aug 4, 2024

Denial of service in Brocade Fabric OS allows remote attackers to slow CLI commands and other operations through security scanning. The CLI component incurs high CPU load while processing scan traffic, but Brocade has not disclosed the responsible request path or CPU-intensive operation. No authentication or user interaction is required; the documented consequence is degraded responsiveness rather than a crash or shutdown.

CVSS severity5.3
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Brocade Fabric OS allows remote attackers to slow CLI commands and other operations through security scanning. The CLI component incurs high CPU load while processing scan traffic, but Brocade has not disclosed the responsible request path or CPU-intensive operation. No authentication or user interaction is required; the documented consequence is degraded responsiveness rather than a crash or shutdown.

The record

CVE
CVE-2020-15386
Published
Jun 9, 2021
Updated
Aug 4, 2024
Vendor
Brocade Communications Systems
Product
Brocade Fabric OS
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Brocade Fabric OS versions after v9.0.0 and before v9.0.1a, and Brocade Fabric OS versions after v8.2.2d and before v8.2.3a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Brocade Communications Systems · Brocade Fabric OSversion=Brocade Fabric OS versions after v9.0.0 and before v9.0.1a, and Brocade Fabric OS versions after v8.2.2d and before v8.2.3a

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3Brocade Communications SystemsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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