CVE-2026-40423
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
A vulnerability in BIG-IP allows termination of the TMM process via undisclosed traffic when a SIP profile is configured on a virtual server. The issue affects F5 Networks software.
Risk Assessment
An attacker can cause disruption of load balancing and network traffic processing services, leading to application unavailability.
Recommendation
Update BIG-IP software to a patched version or apply a temporary workaround recommended by F5. Check the F5 security advisory for details.
Other vulnerabilities in F5 BIG-IP
See all- CVE-2016-9250High
In F5 BIG-IP versions 11.2.1, 11.4.0 through 11.6.1, and 12.0.0 through 12.1.2, an unauthenticated user with access to the control plane may be able to delete arbitrary files through an undisclosed mechanism.
- CVE-2016-9256High
In F5 BIG-IP versions 12.1.0 through 12.1.2, a race condition can occur that may delay the enforcement of permissions by iControl. If the role_map is not reloaded after permissions are changed, a user may gain access to resources they should not have access to.
- CVE-2016-9253High
In F5 BIG-IP versions 12.1.0 through 12.1.2, specific websocket traffic patterns may cause a disruption of service for virtual servers configured to use the websocket profile.
- CVE-2016-9251High
In F5 BIG-IP versions 12.0.0 through 12.1.2, an authenticated attacker may gain elevated privileges through a crafted iControl REST connection.
- CVE-2016-9252High
The Traffic Management Microkernel (TMM) in F5 BIG-IP before 11.5.4 HF3, 11.6.x before 11.6.1 HF2 and 12.x before 12.1.2 does not properly handle minimum path MTU options for IPv6, allowing remote attackers to cause a denial-of-service (DoS) through unspecified vectors.
- CVE-2016-5020High
F5 BIG-IP versions before 12.0.0 HF3 allow remote authenticated users to modify the account configuration of users with the Resource Administration role, potentially gaining privileges via a crafted external Extended Application Verification (EAV) monitor script.
- CVE-2016-4545High
Virtual servers in F5 BIG-IP 11.5.4, when SSL profiles are enabled, allow remote attackers to cause a denial of service through resource consumption and Traffic Management Microkernel restart via an SSL alert during the handshake.
- CVE-1999-1550Medium
The bigconf.conf file in F5 BIG/ip version 2.1.2 and earlier allows remote attackers to read arbitrary files by specifying the target file in the 'file' parameter.
- CVE-2026-40629High
A vulnerability in SSL profiles on a virtual server can cause it to stop processing new client connections due to undisclosed traffic. The issue affects software versions that have not reached End of Technical Support.
- CVE-2026-40462Medium
Incorrect permission assignment vulnerabilities exist in iControl REST and TMOS shell (tmsh) undisclosed command, allowing an authenticated attacker to view sensitive information.
Original NVD description (English source)
When a SIP profile is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.