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CVE-2026-42781 Details
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.
A denial-of-service vulnerability has been identified in F5 BIG-IP systems with embedded Packet Velocity Acceleration (ePVA) configured. Undisclosed local Ethernet traffic can lead to increased resource utilization in both ePVA and the Traffic Management Microkernel (TMM). This performance degradation can cause the TMM process to crash or require a manual restart. The vulnerability affects BIG-IP tenants on F5 r5000, r10000, r12000, BX110, and BX520 systems with ePVA acceleration enabled, while all other F5 rSeries systems are not impacted.
To address this vulnerability, F5 recommends upgrading to a patched version if available. For BIG-IP systems, the vulnerability can be mitigated by disabling ePVA acceleration on affected virtual servers or enforcing ARP security on the connected network.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026Exploitation: NoneAutomatable: NoTechnical Impact: Partial
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://my.f5.com/manage/s/article/K000160862 | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-835 | Loop with Unreachable Exit Condition ('Infinite Loop') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| f5 big-ip access policy manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip advanced firewall manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip advanced web application firewall | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip analytics | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip application acceleration manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip application security manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip application visibility and reporting | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip automation toolchain | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip carrier-grade nat | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip container ingress services | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip ddos hybrid defender | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip domain name system | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip edge gateway | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip fraud protection service | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip global traffic manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip link controller | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip local traffic manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip policy enforcement manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip ssl orchestrator | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip webaccelerator | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip websafe | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 23, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | New CVE Received | [email protected] |