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Vulnerability Intelligence

CVE-2026-94127

CriticalExploitedPublic exploit

BIG-IP APM OAuth vulnerability

Published Sep 22, 2026 · Updated Sep 23, 2026 · Also known as EUVD-2026-84427, GHSA-qppv-6jrg-hxq4

Key Facts

Patch immediately
  • CVE-2026-94127 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Big-Ip Access Policy Manager (F5), BIG-IP.
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 22, 2026. Public exploit code is available.
  • EPSS estimates a 2.2% probability of exploitation in the next 30 days.
  • Fixed versions are available, including BIG-IP Hotfix-BIGIP-17.1.3.5.0.41.14-ENG, BIG-IP Hotfix-BIGIP-17.5.1.9.0.160.12-ENG, BIG-IP Hotfix-BIGIP-21.1.0.2.0.30.22-ENG.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v4

9.3

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS (30-day exploit likelihood)

2.2%

Higher than 82.4% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

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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.

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVSep 22, 2026Sep 25, 2026Not reported
Industry KEV feedSep 22, 2026Sep 25, 2026Not reported
CIRCL KEVSep 22, 2026Sep 25, 2026Not reported
ENISA EUVDSep 22, 2026n/aNot reported

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Products

4 affected entries in total
ProductAffected versionsFixed in
Big-Ip Access Policy ManagerF521.1.017.1.3
BIG-IP>= 17.5.0, >= 21.1.0Hotfix-BIGIP-17.5.1.9.0.160.12-ENG

Patched Releases

BIG-IP

Hotfix-BIGIP-17.1.3.5.0.41.14-ENG, Hotfix-BIGIP-17.5.1.9.0.160.12-ENG, Hotfix-BIGIP-21.1.0.2.0.30.22-ENG

Big-Ip Access Policy Manager

17.1.3

Timeline

  1. Publicly disclosed

    Sep 22, 2026

  2. Added to CISA KEV

    Sep 22, 2026

  3. Added to Industry KEV feed

    Sep 22, 2026

  4. Added to CIRCL KEV

    Sep 22, 2026

  5. Added to ENISA EUVD

    Sep 22, 2026

  6. Last updated

    Sep 23, 2026

Weakness Type

  • CWE-122 Heap-based Buffer Overflow

References

FAQ

Common Questions.

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