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CVE-2026-94127

F5 BIG-IP APM Heap-based Buffer Overflow

9.8 CRITICALActively exploited (CISA KEV)EPSS 2.23%
  1. Published22 Sept 2026
  2. Added to CISA KEV22 Sept 2026
  3. Remediation due25 Sept 2026
Actively exploited (CISA KEV)

F5 BIG-IP APM contains a heap-based buffer overflow vulnerability when access policy and an OAuth profile are configured on a virtual server. This vulnerability could allow an unauthenticated attacker to perform remote code execution.

Added to KEV: 22 Sept 2026Federal remediation due: 25 Sept 2026

Description

When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic can lead to remote code execution (RCE). This vulnerability is only present when BIG-IP APM is configured as an OAuth Authorization Server. Deployments using APM strictly as an OAuth Client / Resource Server (without OAuth authorization server profiles configured) are not affected by this vulnerability. Impact: This vulnerability allows an unauthenticated attacker to perform remote code execution. The BIG-IP system in Appliance mode is also vulnerable. This is a data plane issue; there is no control plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

F5 Big-ip Access Policy Manager≥ 17.0.0 ≤ 17.1.3 · ≥ 17.5.0 ≤ 17.5.1 · 21.1.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-94127 being actively exploited?

Yes. CVE-2026-94127 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 22 Sept 2026.

How severe is CVE-2026-94127?

CVE-2026-94127 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 2.23% probability of exploitation.

Which products are affected by CVE-2026-94127?

Affected products include F5 Big-ip Access Policy Manager.

How do I fix CVE-2026-94127?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-94127 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.