CVE-2026-42781: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in F5 BIG-IP
When embedded Packet Velocity Acceleration (ePVA) acceleration is configured, undisclosed local ethernet traffic can cause an increase in ePVA and Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
AI Analysis
Technical Summary
This vulnerability in F5 BIG-IP arises from a loop with an unreachable exit condition (infinite loop) when ePVA acceleration is enabled. Undisclosed local ethernet traffic can cause the ePVA and TMM components to consume excessive resources, potentially impacting system availability. The CVSS 3.1 base score is 6.5 (medium), reflecting an attack vector requiring adjacent network access, no privileges, and no user interaction, with impact limited to availability. No official fix or mitigation has been published by the vendor as of the data provided.
Potential Impact
The vulnerability can cause increased resource utilization in critical components of the BIG-IP system, specifically ePVA and TMM, leading to potential denial of service conditions. Confidentiality and integrity are not impacted. Exploitation requires access to local ethernet traffic and does not require privileges or user interaction. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or temporary workaround is provided, monitor vendor communications for updates. Until a fix is available, consider limiting exposure of ePVA-enabled BIG-IP devices to untrusted local ethernet traffic if feasible.
CVE-2026-42781: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in F5 BIG-IP
Description
When embedded Packet Velocity Acceleration (ePVA) acceleration is configured, undisclosed local ethernet traffic can cause an increase in ePVA and Traffic Management Microkernel (TMM) resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in F5 BIG-IP arises from a loop with an unreachable exit condition (infinite loop) when ePVA acceleration is enabled. Undisclosed local ethernet traffic can cause the ePVA and TMM components to consume excessive resources, potentially impacting system availability. The CVSS 3.1 base score is 6.5 (medium), reflecting an attack vector requiring adjacent network access, no privileges, and no user interaction, with impact limited to availability. No official fix or mitigation has been published by the vendor as of the data provided.
Potential Impact
The vulnerability can cause increased resource utilization in critical components of the BIG-IP system, specifically ePVA and TMM, leading to potential denial of service conditions. Confidentiality and integrity are not impacted. Exploitation requires access to local ethernet traffic and does not require privileges or user interaction. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or temporary workaround is provided, monitor vendor communications for updates. Until a fix is available, consider limiting exposure of ePVA-enabled BIG-IP devices to untrusted local ethernet traffic if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-04-30T23:02:47.666Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a049713cbff5d8610dffdf8
Added to database: 5/13/2026, 3:21:55 PM
Last enriched: 5/13/2026, 3:52:21 PM
Last updated: 5/14/2026, 6:52:25 AM
Views: 8
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