CVE-2020-5874Network attack vector

Unauthenticated service interruption via OpenID request

Published Apr 30, 2020 · Updated Aug 4, 2024

Denial of service in F5 BIG-IP APM allows remote attackers to restart TMM through crafted requests to an affected virtual server. When an APM virtual server tied to an access policy uses OpenID, a specially modified request causes the Traffic Management Microkernel to restart. No authentication or user interaction is required; each restart interrupts service and triggers failover in a high-availability pair.

CVSS severity7.5
High
EPSS probability1.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in F5 BIG-IP APM allows remote attackers to restart TMM through crafted requests to an affected virtual server. When an APM virtual server tied to an access policy uses OpenID, a specially modified request causes the Traffic Management Microkernel to restart. No authentication or user interaction is required; each restart interrupts service and triggers failover in a high-availability pair.

The record

CVE
CVE-2020-5874
Published
Apr 30, 2020
Updated
Aug 4, 2024
Vendor
F5 Networks
Product
BIG-IP Access Policy Manager
Classifications
T1499
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=15.0.0-15.0.1.2, 14.1.0-14.1.2.3, 14.0.0-14.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IP Access Policy Managerversion=15.0.0-15.0.1.2, 14.1.0-14.1.2.3, 14.0.0-14.0.1

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NVDAV: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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo