VulnSocial

CVE-2026-39458Disclosure(f5 / big-ip_access_policy_manager)

LOWCVSS 8.7 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), 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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2.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-824

Priority

LOW

Exploitation

NONE

PoC

YES

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

  • Public PoC is present in monitored signal
  • 1 mentions across 1 observed day

What's happening

  • PoC mentioned or linked in 1 signal
  • 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: 1PoC Mentioned / Linked · 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-2026-39458 | F5 BIG-IP prior 17.1.3.2/17.5.1.6/21.0.0.1 Traffic Management Microkernel uninitialized pointer (K000160945 / WID-SEC-2026-1532) https://ift.tt/aXZVhwE A vulnerability has been found in F5 BIG-IP and classified as critical. Impacted is an unknown function of t…

    Post summary

    The post announces a critical uninitialized pointer vulnerability (CVE‑2026‑39458) in F5 BIG‑IP versions prior to 17.1.3.2, 17.5.1.6, and 21.0.0.1, with a link to further details.

    0000056
    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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