CVE-2026-94127

Published Sep 22, 2026

Last updated an hour ago

Exploit known CVSS critical 9.3

Network

Zero-day

IoT

Supply chain

VPN

BIG-IP APM

BIG-IP

OAuth Authorization Server

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-94127 is a heap-based buffer overflow vulnerability found in F5 BIG-IP Access Policy Manager (APM). This flaw specifically affects systems where an access policy and an OAuth profile are configured on a virtual server. The vulnerability allows an unauthenticated attacker to achieve remote code execution by sending specially crafted malicious traffic to the affected BIG-IP APM system. This issue has been observed to be actively exploited in the wild.

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.
Source: f5sirt@f5.com
NVD status: Analyzed
Products: big-ip_access_policy_manager

Risk scores

CVSS 4.0

Type: Secondary
Base score: 9.3
Impact score: -
Exploitability score: -
Vector string: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity: CRITICAL

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
Exploit added on: Sep 22, 2026
Exploit action due: Sep 25, 2026
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.

Weaknesses

f5sirt@f5.com: CWE-122

Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.

Hype score: 11

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "E2AC01C3-F47E-4F42-A4EB-90DE63C834CC",
            "versionEndIncluding": "17.1.3",
            "versionStartIncluding": "17.0.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "BD71EC53-8ABC-410F-B031-0B3288D2E8DF",
            "versionEndIncluding": "17.5.1",
            "versionStartIncluding": "17.5.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:f5:big-ip_access_policy_manager:21.1.0:*:*:*:*:*:*:*",
            "matchCriteriaId": "8D26D424-54C1-4B2C-BBB8-C79E925BED7F",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.