CVE-2023-22281Network attack vector

Traffic interruption via uninitialized TMM resource

Published Feb 1, 2023 · Updated Mar 26, 2025

Denial of service in affected F5 BIG-IP AFM releases allows remote attackers to terminate TMM by sending traffic to a virtual server. The CNA maps the flaw to use of an uninitialized resource, but F5 has not disclosed the specific TMM resource or traffic pattern involved. Exposure requires a destination NAT rule in an AFM NAT policy on a FastL4 virtual server, and successful exploitation interrupts traffic processing.

CVSS severity7.5
High
EPSS probability0.63%
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 affected F5 BIG-IP AFM releases allows remote attackers to terminate TMM by sending traffic to a virtual server. The CNA maps the flaw to use of an uninitialized resource, but F5 has not disclosed the specific TMM resource or traffic pattern involved. Exposure requires a destination NAT rule in an AFM NAT policy on a FastL4 virtual server, and successful exploitation interrupts traffic processing.

The record

CVE
CVE-2023-22281
Published
Feb 1, 2023
Updated
Mar 26, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-908, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2025Record 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=13.1.0 <*
  2. Affected versionversion=14.1.0 <14.1.5.3
  3. Affected versionversion=15.1.0 <15.1.8
  4. Affected versionversion=16.1.0 <16.1.3.3
  5. Affected versionversion=17.0.0 <17.0.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=13.1.0 <*; version=14.1.0 <14.1.5.3; version=15.1.0 <15.1.8; version=16.1.0 <16.1.3.3; version=17.0.0 <17.0.0.2

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5F5CVSS:3.1/AV:N/AC:L/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

CWE-908Use of Uninitialized Resource
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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