CVE-2020-5887Network attack vector

Daemon access via IPv6 port lockdown bypass

Published Apr 30, 2020 · Updated Aug 4, 2024

Resource exposure in F5 BIG-IP Virtual Edition allows remote attackers to access local daemons despite port lockdown settings. Within TMM, IPv6 traffic sent to a floating self IP through an IPv6 forwarding virtual server reaches protected local services instead of remaining subject to port lockdown. The exposure requires an HTTP profile with explicit proxy enabled and default-connect-handling set to allow, and it is reachable from adjacent networks.

CVSS severity9.1
Critical
EPSS probability1.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exposure in F5 BIG-IP Virtual Edition allows remote attackers to access local daemons despite port lockdown settings. Within TMM, IPv6 traffic sent to a floating self IP through an IPv6 forwarding virtual server reaches protected local services instead of remaining subject to port lockdown. The exposure requires an HTTP profile with explicit proxy enabled and default-connect-handling set to allow, and it is reachable from adjacent networks.

The record

CVE
CVE-2020-5887
Published
Apr 30, 2020
Updated
Aug 4, 2024
Vendor
F5 Networks
Product
BIG-IP Virtual Edition
Classifications
CWE-668, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 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

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=15.1.0-15.1.0.1, 15.0.0-15.0.1.2, 14.1.0-14.1.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IP Virtual Editionversion=15.1.0-15.1.0.1, 15.0.0-15.0.1.2, 14.1.0-14.1.2.3

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
9.1NIST NVDCVSS:3.1/AV:N/AC:L/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-668Exposure of Resource to Wrong Sphere
T1190Exploit Public-Facing Application

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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