CVE-2020-5854Network attack vector

Unauthenticated traffic interruption via TMM crash

Published Feb 6, 2020 · Updated Aug 4, 2024

Denial of service in the F5 Networks BIG-IP TMM allows remote attackers to interrupt traffic processing through network connections. With a connector profile configured, a specific but undisclosed connection sequence makes TMM produce a core file and restart; F5 has not published the faulty operation. No authentication or user interaction is required; the outage is temporary while TMM recovers, and a device group can fail over.

CVSS severity5.9
Medium
EPSS probability0.81%
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 the F5 Networks BIG-IP TMM allows remote attackers to interrupt traffic processing through network connections. With a connector profile configured, a specific but undisclosed connection sequence makes TMM produce a core file and restart; F5 has not published the faulty operation. No authentication or user interaction is required; the outage is temporary while TMM recovers, and a device group can fail over.

The record

CVE
CVE-2020-5854
Published
Feb 6, 2020
Updated
Aug 4, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
T1499.004
Attack vector
network
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

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=11.6.0-11.6.5.1
  2. Affected versionversion=12.1.0-12.1.5
  3. Affected versionversion=13.1.0-13.1.3.1
  4. Affected versionversion=14.0.0-14.0.1
  5. Affected versionversion=14.1.0-14.1.2.2
  6. Affected versionversion=15.0.0-15.0.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=11.6.0-11.6.5.1; version=12.1.0-12.1.5; version=13.1.0-13.1.3.1; version=14.0.0-14.0.1; version=14.1.0-14.1.2.2; version=15.0.0-15.0.1.1

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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

T1499.004Application or System Exploitation

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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