CVE-2020-5855

Physical-access shell via Windows Logon Integration

Published Feb 6, 2020 · Updated Aug 4, 2024

Authentication bypass in BIG-IP Edge Client for Windows allows attackers with physical access to an authorized machine to obtain an unprivileged shell. The Windows Logon Integration configuration exposes a logon path that grants shell access without authorization to the person at the console. Exploitation requires physical access and the feature enabled; the resulting shell runs with unprivileged user rights.

CVSS severity4.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in BIG-IP Edge Client for Windows allows attackers with physical access to an authorized machine to obtain an unprivileged shell. The Windows Logon Integration configuration exposes a logon path that grants shell access without authorization to the person at the console. Exploitation requires physical access and the feature enabled; the resulting shell runs with unprivileged user rights.

The record

CVE
CVE-2020-5855
Published
Feb 6, 2020
Updated
Aug 4, 2024
Vendor
F5 Networks
Product
BIG-IP Edge Client
Classifications
T1059.003
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 6, 2020CVE 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?

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

  1. Affected versionversion=All

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IP Edge Clientversion=All

Published CVSS scores

4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
4.3NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

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No observations available

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

Weakness, pattern, technique

T1059.003Windows Command Shell

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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