CVE-2023-22340Network attack vector

TMM termination via SIP traffic

Published Feb 1, 2023 · Updated Mar 26, 2025

NULL pointer dereference in F5 BIG-IP allows remote attackers to terminate TMM through traffic sent to a SIP Message Routing virtual server. F5 has not disclosed which TMM SIP-processing locus dereferences a null pointer or which traffic property reaches it. The issue is reachable only when a SIP profile is configured on a Message Routing virtual server, and its reported consequence is TMM termination.

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

NULL pointer dereference in F5 BIG-IP allows remote attackers to terminate TMM through traffic sent to a SIP Message Routing virtual server. F5 has not disclosed which TMM SIP-processing locus dereferences a null pointer or which traffic property reaches it. The issue is reachable only when a SIP profile is configured on a Message Routing virtual server, and its reported consequence is TMM termination.

The record

CVE
CVE-2023-22340
Published
Feb 1, 2023
Updated
Mar 26, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-476, 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

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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=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

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

Published CVSS scores

7.5F5 NetworksCVSS: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-476NULL Pointer Dereference
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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