CVE-2026-94127 — F5 Big-ip Access Policy Manager
CISA KEVAs of 2026-09-23, CVE-2026-94127 is a CRITICAL-severity vulnerability in F5 Big-ip Access Policy Manager, CVSS v3.1 9.8, EPSS 1.3% (71.1th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-09-22), with a US federal remediation deadline of 2026-09-25. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-94127, most recently “CVE-2026-94127: Critical F5 BIG-IP APM Zero-Day Heap Overflow in OAuth Authorization Server Exploited for Unauthenticated Remote Code Execution”.
Last updated: 2026-09-23
What is 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.
The record classifies CVE-2026-94127 under weakness class CWE-122. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 2 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v4.0 base score
- 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 (FIRST)
- 1.3% probability of exploitation in the next 30 days, higher than 71.1% of all scored CVEs
- CISA KEV
- Listed since 2026-09-22, federal remediation deadline 2026-09-25
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-09-22, last modified 2026-09-23
Is CVE-2026-94127 being exploited?
CISA added CVE-2026-94127 to the Known Exploited Vulnerabilities catalog on 2026-09-22, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-09-25 under BOD 22-01. Weaponised exploit code for CVE-2026-94127 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 65 in the Threadlinqs vulnerability feed.
- FurkanKAYAPINAR/CVE-2026-94127 (github)
Affected products and versions
- F5: BIG-IP
How to fix CVE-2026-94127
Vendor advisory: https://my.f5.com/manage/s/article/K000162605. Because CVE-2026-94127 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-09-25. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-94127
1 tracked threat in the Threadlinqs corpus references CVE-2026-94127, either in the campaign’s CVE list or as an indicator on the campaign record.
- CVE-2026-94127: Critical F5 BIG-IP APM Zero-Day Heap Overflow in OAuth Authorization Server Exploited for Unauthenticated Remote Code Execution — CRITICAL · 2026-09-23
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.
Vendor advisory and patch
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