CVE-2022-23027Network attack vector

Connection denial via undisclosed virtual-server requests

Published Jan 25, 2022 · Updated Aug 3, 2024

Denial of service in F5 BIG-IP 15.1.x before 15.1.4 and 14.1.x before 14.1.4.4 allows remote attackers to block new client connections. F5 has not disclosed the request or comparison error, but processing fails only when one virtual server combines FastL4 with HTTP, FIX, or hash persistence. The same condition affects 13.1.x beginning in 13.1.3.6, 12.1.5.3 through 12.1.6, and 11.6.5.2, with no reported data access or configuration change.

CVSS severity5.3
Medium
EPSS probability0.92%
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-IP 15.1.x before 15.1.4 and 14.1.x before 14.1.4.4 allows remote attackers to block new client connections. F5 has not disclosed the request or comparison error, but processing fails only when one virtual server combines FastL4 with HTTP, FIX, or hash persistence. The same condition affects 13.1.x beginning in 13.1.3.6, 12.1.5.3 through 12.1.6, and 11.6.5.2, with no reported data access or configuration change.

The record

CVE
CVE-2022-23027
Published
Jan 25, 2022
Updated
Aug 3, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-697, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2022CVE 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=15.1.x before 15.1.4, 14.1.x before 14.1.4.4, 13.1.x beginning in 13.1.3.6, 12.1.5.3-12.1.6, and 11.6.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.x before 15.1.4, 14.1.x before 14.1.4.4, 13.1.x beginning in 13.1.3.6, 12.1.5.3-12.1.6, and 11.6.5.2

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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-697Incorrect Comparison
T1499.004Endpoint Denial of Service: Application 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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