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🛡️ CVE-2026-42409 — big-ip-access-policy-manager

🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-476 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-42409 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2026-42409 is recorded against 23 packages.

  • big-ip-access-policy-manager (from 17.5.0 up to 17.5.1)
  • big-ip-advanced-firewall-manager (from 17.5.0 up to 17.5.1)
  • big-ip-advanced-web-application-firewall (from 17.5.0 up to 17.5.1)
  • big-ip-analytics (from 17.5.0 up to 17.5.1)
  • big-ip-application-acceleration-manager (from 17.5.0 up to 17.5.1)
  • big-ip-application-security-manager (from 17.5.0 up to 17.5.1)
  • big-ip-application-visibility-and-reporting (from 17.5.0 up to 17.5.1)
  • big-ip-automation-toolchain (from 17.5.0 up to 17.5.1)
  • big-ip-carrier-grade-nat (from 17.5.0 up to 17.5.1)
  • big-ip-container-ingress-services (from 17.5.0 up to 17.5.1)
  • big-ip-ddos-hybrid-defender (from 17.5.0 up to 17.5.1)
  • big-ip-domain-name-system (from 17.5.0 up to 17.5.1)
  • big-ip-edge-gateway (from 17.5.0 up to 17.5.1)
  • big-ip-fraud-protection-service (from 17.5.0 up to 17.5.1)
  • big-ip-global-traffic-manager (from 17.5.0 up to 17.5.1)
  • big-ip-link-controller (from 17.5.0 up to 17.5.1)
  • big-ip-local-traffic-manager (from 17.5.0 up to 17.5.1)
  • big-ip-next-cloud-native-network-functions (from 2.0.0 up to 2.0.2)
  • big-ip-next-for-kubernetes (from 2.0.0 up to 2.1.0)
  • big-ip-policy-enforcement-manager (from 17.5.0 up to 17.5.1)
  • big-ip-ssl-orchestrator (from 17.5.0 up to 17.5.1)
  • big-ip-webaccelerator (from 17.5.0 up to 17.5.1)
  • big-ip-websafe (from 17.5.0 up to 17.5.1)

Timeline and source

Published on 13 May 2026 and last revised on 23 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

my.f5.com

Other advisories for this package

big-ip-access-policy-manager has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-476: NULL Pointer Dereference) in other software:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ✅ No
Source NVD
Published 2026-05-13
Updated 2026-08-20
Modified 2026-06-23
Fix URL N/A

Affected Packages

Software From version Fixed in
big-ip-access-policy-manager 17.5.0 17.5.1
big-ip-advanced-firewall-manager 17.5.0 17.5.1
big-ip-advanced-web-application-firewall 17.5.0 17.5.1
big-ip-analytics 17.5.0 17.5.1
big-ip-application-acceleration-manager 17.5.0 17.5.1
big-ip-application-security-manager 17.5.0 17.5.1
big-ip-application-visibility-and-reporting 17.5.0 17.5.1
big-ip-automation-toolchain 17.5.0 17.5.1
big-ip-carrier-grade-nat 17.5.0 17.5.1
big-ip-container-ingress-services 17.5.0 17.5.1
big-ip-ddos-hybrid-defender 17.5.0 17.5.1
big-ip-domain-name-system 17.5.0 17.5.1
big-ip-edge-gateway 17.5.0 17.5.1
big-ip-fraud-protection-service 17.5.0 17.5.1
big-ip-global-traffic-manager 17.5.0 17.5.1
big-ip-link-controller 17.5.0 17.5.1
big-ip-local-traffic-manager 17.5.0 17.5.1
big-ip-next-cloud-native-network-functions 2.0.0 2.0.2
big-ip-next-for-kubernetes 2.0.0 2.1.0
big-ip-policy-enforcement-manager 17.5.0 17.5.1
big-ip-ssl-orchestrator 17.5.0 17.5.1
big-ip-webaccelerator 17.5.0 17.5.1
big-ip-websafe 17.5.0 17.5.1

References

Mitigation, Vendor Advisory https://my.f5.com/manage/s/article/K000159034

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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