CVE-2022-23011Network attack vector

Virtual-server outage via SYN cookie miscalculation

Published Jan 25, 2022 · Updated Aug 3, 2024

Incorrect calculation in F5 BIG-IP 15.1.x before 15.1.4 and 14.1.x before 14.1.3 allows remote attackers to interrupt virtual servers. The SYN Cookie Protection feature performs an incorrect, undisclosed calculation while processing TCP traffic on certain hardware platforms. Exploitation requires a supported hardware platform using the affected feature and can stop virtual servers from accepting traffic.

CVSS severity7.5
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect calculation in F5 BIG-IP 15.1.x before 15.1.4 and 14.1.x before 14.1.3 allows remote attackers to interrupt virtual servers. The SYN Cookie Protection feature performs an incorrect, undisclosed calculation while processing TCP traffic on certain hardware platforms. Exploitation requires a supported hardware platform using the affected feature and can stop virtual servers from accepting traffic.

The record

CVE
CVE-2022-23011
Published
Jan 25, 2022
Updated
Aug 3, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-682, 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 and 14.1.x before 14.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.x before 15.1.4 and 14.1.x before 14.1.3

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

CWE-682Incorrect Calculation
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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