CVE-2021-22996Network attack vector

Cluster service interruption via undisclosed message

Published Mar 31, 2021 · Updated Aug 3, 2024

Denial of service in F5 BIG-IQ Centralized Management 7.x allows remote attackers to abort corosync with an undisclosed message. The message is received by an auto-failover DCD cluster member, but F5 has not disclosed its format or the exact faulty operation that aborts corosync. The affected state requires an auto-failover DCD cluster; aborting corosync can destabilize high availability and interrupt service.

CVSS severity7.5
High
EPSS probability0.97%
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 F5 BIG-IQ Centralized Management 7.x allows remote attackers to abort corosync with an undisclosed message. The message is received by an auto-failover DCD cluster member, but F5 has not disclosed its format or the exact faulty operation that aborts corosync. The affected state requires an auto-failover DCD cluster; aborting corosync can destabilize high availability and interrupt service.

The record

CVE
CVE-2021-22996
Published
Mar 31, 2021
Updated
Aug 3, 2024
Vendor
F5 Networks
Product
BIG-IQ Centralized Management
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 7.x versons

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IQ Centralized Managementversion=All 7.x versons

Published CVSS scores

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

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Your stack

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