{"cve":{"cve_id":"CVE-2026-94127","is_kev":true,"kev_date_added":"2026-09-22","kev_vendor_project":"F5","kev_product":"BIG-IP APM","kev_vulnerability_name":"F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability","kev_short_description":"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.","kev_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.","kev_due_date":"2026-09-25","kev_known_ransomware":false,"kev_notes":"For temporary mitigation to allow for proactive forensic triage, apply the vendor-provided iRule. Once completed, install the final vendor patch as soon as possible. For more information please see: https://my.f5.com/manage/s/article/K000162605 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-94127","kev_cwes":["CWE-122"],"epss_score":0.02226,"epss_percentile":0.82396,"epss_as_of":"2026-10-15","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.\n\nImpact:\nThis 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.\n\n \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","published_at":"2026-09-22T14:17:42.730000Z","last_modified_at":"2026-09-23T14:32:07.910000Z","cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":9.3,"cvss_v4_vector":"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","cvss_v4_severity":"CRITICAL","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-122"],"nvd_references":["https://my.f5.com/manage/s/article/K000162605"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-22T14:33:11.659169Z","updated_at":"2026-09-24T15:44:00.920957Z"},"effective_severity":"CRITICAL","badges":["kev","news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"21.1.0","version_start_inclusive":true,"version_end":"Hotfix-BIGIP-21.1.0.2.0.30.22-ENG","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:21.1.0:Hotfix-BIGIP-21.1.0.2.0.30.22-ENG"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"17.5.0","version_start_inclusive":true,"version_end":"Hotfix-BIGIP-17.5.1.9.0.160.12-ENG","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:17.5.0:Hotfix-BIGIP-17.5.1.9.0.160.12-ENG"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"17.1.0","version_start_inclusive":true,"version_end":"Hotfix-BIGIP-17.1.3.5.0.41.14-ENG","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:17.1.0:Hotfix-BIGIP-17.1.3.5.0.41.14-ENG"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip-access-policy-manager","product_name":"big-ip_access_policy_manager","version_start":"17.0.0","version_start_inclusive":true,"version_end":"17.1.3","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip-access-policy-manager","product_name":"big-ip_access_policy_manager","version_start":"21.1.0","version_start_inclusive":true,"version_end":"21.1.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:big-ip_access_policy_manager:21.1.0:*:*:*:*:*:*:*"}],"exploit_refs":[],"news":[{"id":2047,"source":"The Hacker News","url":"https://thehackernews.com/2026/09/f5-patches-critical-big-ip-apm-zero-day.html","title":"F5 Patches Critical BIG-IP APM Zero-Day Exploited for Unauthenticated RCE on OAuth Servers","summary":"Attackers are exploiting a critical flaw in F5 BIG-IP Access Policy Manager (APM) that lets them run code on a BIG-IP system without logging in, F5 says.\n\nThe flaw, CVE-2026-94127, affects only systems in which APM serves as an OAuth authorization server, issuing access tokens to applications. F5 disclosed it in an advisory on September 22 and has released engineering hotfixes.","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_ZqCwuuKS7TqNWQ7GpeE07JLzHNn4Jdb2O6iQAlY34SiP2it2VwgmeVm5OjAzoAEHFQRVJENdDNGQL94ibPy1AiB9qkpNxZ3ILA89tYlwqm2OO9tEOH_BZ9HZzObw0nrzszQoKnaCQ-Q8ez5DPsnrKjq40qhm2tu_DhMSFunkVRsHeEIc0IA2NL-yZ5g/s1600/f5-zero-day.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-09-23T08:29:48Z","fetched_at":"2026-09-23T08:46:12.436569Z","trending_score":0.00001207842177415561,"cve_ids":["CVE-2026-94127"]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000162605","source_type":"MISC","tags":[]}],"timeline":[{"type":"cisa_reported","at":"2026-09-22T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"published","at":"2026-09-22T14:17:42.730000Z","label":"CVE published","source":null},{"type":"first_article","at":"2026-09-23T08:29:48Z","label":"First news coverage","source":"The Hacker News"}]}