CVE-2026-94127
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.
do firstApply 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.
Can a WAF block it? Partly. Cloudflare publishes WAF a rule written for this CVE. Such rules block the known exploit requests and buy time, but attackers can change the request to get past them, so they do not replace the patch.
Cloudflare · 1 rule (Block) · since 6 Oct 2026
- F5 BIG-IP - UnAuth Heap-Overflow - CVE:CVE-2026-94127 · Cloudflare Managed Ruleset
Also consider: patch · enable the vendor rule in block mode
Based on WAF vendor rules published for this CVE. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2026-94127 being exploited?
Yes. CVE-2026-94127 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-94127?
CVE-2026-94127 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-94127?
Yes. A fix has been recorded for CVE-2026-94127. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-94127 affect?
CVE-2026-94127 affects f5:big-ip_access_policy_manager. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
- affected>= 21.1.0 and < Hotfix-BIGIP-21.1.0.2.0.30.22-ENG
- affected>= 17.5.0 and < Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
- affected>= 17.1.0 and < Hotfix-BIGIP-17.1.3.5.0.41.14-ENG
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
public exploits
Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- yes
- technical impact
- total
Assessed by CISA 22 Sept 2026 (SSVC 2.0.3).
timeline
- 22 Sept 2026Added to CISA KEV (exploited in the wild)
- 22 Sept 2026CISA SSVC assessment: exploitation active · same day later
- 22 Sept 2026Published · 1 day later
- 23 Sept 2026First proof-of-concept repository on GitHub (unvetted) · same day later
- 23 Sept 2026CVE record last updated · same day later
- 25 Sept 2026CISA remediation due date (US federal agencies) · 2 days later
- 2 Nov 2026Analysed by vulneraibility.com · 39 days later
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.