CVE-2020-15387Network attack vector

Man-in-the-middle exposure via weak SSH keys

Published Jun 9, 2021 · Updated Aug 4, 2024

Weak cryptography in Brocade Fabric OS and Brocade SANnav before their listed fixed releases allows remote attackers to intercept SSH communications. Host SSH servers generate or use keys shorter than 2048 bits, reducing key strength and enabling man-in-the-middle positioning to read or alter sessions. Exploitation requires network interception between an SSH client and the host; the records describe confidentiality and integrity exposure but no availability impact.

CVSS severity7.4
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak cryptography in Brocade Fabric OS and Brocade SANnav before their listed fixed releases allows remote attackers to intercept SSH communications. Host SSH servers generate or use keys shorter than 2048 bits, reducing key strength and enabling man-in-the-middle positioning to read or alter sessions. Exploitation requires network interception between an SSH client and the host; the records describe confidentiality and integrity exposure but no availability impact.

The record

CVE
CVE-2020-15387
Published
Jun 9, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-326, T1557
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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
7.4NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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

CWE-326Use of a Key Past its Expiration Date
T1557Adversary-in-the-Middle

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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