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CVE-2026-42781: CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop') in F5 BIG-IP

0
Medium
VulnerabilityCVE-2026-42781cvecve-2026-42781cwe-835
Published: Wed May 13 2026 (05/13/2026, 14:12:31 UTC)
Source: CVE Database V5
Vendor/Project: F5
Product: 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

AILast updated: 05/13/2026, 15:52:21 UTC

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.

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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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