VulnSocial

CVE-2026-42920Disclosure(f5 / big-ip_access_policy_manager)

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

When a Client SSL profile is configured with Allow Dynamic Record Sizing on a UDP 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.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-835

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • big-ip_access_policy_manager
  • big-ip_advanced_firewall_manager
  • big-ip_advanced_web_application_firewall
  • big-ip_analytics

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
f5
Products
big-ip_access_policy_managerbig-ip_advanced_firewall_managerbig-ip_advanced_web_application_firewallbig-ip_analyticsbig-ip_application_acceleration_managerbig-ip_application_security_managerbig-ip_application_visibility_and_reportingbig-ip_automation_toolchainbig-ip_carrier-grade_natbig-ip_container_ingress_services

1 version affected across 21 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-05-17: 1Technical Details · 2026-05-17: 105-17
Signal classification1 categories
Disclosure
1100.0%
Referenced assets1 URL
By indicator
Full discourse1 post
  • Israel@f1tym1
    Disclosure

    CVE-2026-42920 | F5 BIG-IP prior 17.1.3.1/17.5.1.4/21.0.0.1 Traffic Management Microkernel infinite loop (K000160901 / WID-SEC-2026-1532) https://ift.tt/HK65rPJ A vulnerability, which was classified as problematic, was found in F5 BIG-IP. The impacted element is an unknown fun…

    Post summary

    The post announces CVE‑2026‑42920, an infinite‑loop flaw in F5 BIG‑IP’s Traffic Management Microkernel that impacts earlier releases (prior to 17.1.3.1/17.5.1.4/21.0.0.1).

    0101071
    974 followersView on X
CPE platform detail42 entries

42 of 42 entries

PartVendorProductVersionTarget SWTarget HW
Appf5big-ip_access_policy_manager---
Appf5big-ip_access_policy_manager21.0.0--
Appf5big-ip_advanced_firewall_manager---
Appf5big-ip_advanced_firewall_manager21.0.0--
Appf5big-ip_advanced_web_application_firewall---
Appf5big-ip_advanced_web_application_firewall21.0.0--
Appf5big-ip_analytics---
Appf5big-ip_analytics21.0.0--
Appf5big-ip_application_acceleration_manager---
Appf5big-ip_application_acceleration_manager21.0.0--
Appf5big-ip_application_security_manager---
Appf5big-ip_application_security_manager21.0.0--
Appf5big-ip_application_visibility_and_reporting---
Appf5big-ip_application_visibility_and_reporting21.0.0--
Appf5big-ip_automation_toolchain---
Appf5big-ip_automation_toolchain21.0.0--
Appf5big-ip_carrier-grade_nat---
Appf5big-ip_carrier-grade_nat21.0.0--
Appf5big-ip_container_ingress_services---
Appf5big-ip_container_ingress_services21.0.0--
Appf5big-ip_ddos_hybrid_defender---
Appf5big-ip_ddos_hybrid_defender21.0.0--
Appf5big-ip_domain_name_system---
Appf5big-ip_domain_name_system21.0.0--
Appf5big-ip_edge_gateway---
Appf5big-ip_edge_gateway21.0.0--
Appf5big-ip_fraud_protection_service---
Appf5big-ip_fraud_protection_service21.0.0--
Appf5big-ip_global_traffic_manager---
Appf5big-ip_global_traffic_manager21.0.0--
Appf5big-ip_link_controller---
Appf5big-ip_link_controller21.0.0--
Appf5big-ip_local_traffic_manager---
Appf5big-ip_local_traffic_manager21.0.0--
Appf5big-ip_policy_enforcement_manager---
Appf5big-ip_policy_enforcement_manager21.0.0--
Appf5big-ip_ssl_orchestrator---
Appf5big-ip_ssl_orchestrator21.0.0--
Appf5big-ip_webaccelerator---
Appf5big-ip_webaccelerator21.0.0--
Appf5big-ip_websafe---
Appf5big-ip_websafe21.0.0--

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