CVE-2026-94127 (GCVE-0-2026-94127)

Vulnerability from cvelistv5 – Published: 2026-09-22 14:17 – Updated: 2026-09-23 03:55
VLAI CISA CIRCL ENISA Previdian
Title
BIG-IP APM OAuth vulnerability
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3 (Critical)
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
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 00:00 UTC
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
f5 CNA under the mitre root
CNA scorecard B 85/100 over 36 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
F5 BIG-IP Affected: 21.1.0 , < Hotfix-BIGIP-21.1.0.2.0.30.22-ENG (custom)
Affected: 17.5.0 , < Hotfix-BIGIP-17.5.1.9.0.160.12-ENG (custom)
Affected: 17.1.0 , < Hotfix-BIGIP-17.1.3.5.0.41.14-ENG (custom)
guessed Create a notification for this product.
Date Public
2026-09-22 14:00
Credits
F5
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7c9832c8-96e6-44ce-8281-2bd2ad8172ad

Vulnerability ID: CVE-2026-94127

Status: Confirmed

Status Updated: 2026-09-22 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-22
Asserted: 2026-09-22
Scope
Notes: F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability | Affected: F5 / BIG-IP APM | 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. | 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. | Due date: 2026-09-25 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-122
Feed CISA Known Exploited Vulnerabilities Catalog
Product BIG-IP APM
Due Date 2026-09-25
Date Added 2026-09-22
Vendorproject F5
Vulnerabilityname F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-09-22 20:00 UTC | Updated: 2026-09-22 20:00 UTC
CIRCL
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6881229b-5680-4ea1-a3bc-e323ad246649

Vulnerability ID: CVE-2026-94127

Status: Confirmed

Status Updated: 2026-09-23 14:15 UTC

Exploited: Yes

Characteristics
Remote Code Execution: Yes
Authentication Required: No
Local Access Required: Remote
Severity: 100.0
Timestamps
First Seen: 2026-09-23
Asserted: 2026-09-23
Last Seen: 2026-09-23
Created: 2026-09-25 05:44 UTC | Updated: 2026-09-23 14:15 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4f4e073a-dd5c-4fc3-9e8c-33354c5ee102

Vulnerability ID: CVE-2026-94127

Status: Confirmed

Status Updated: 2026-09-22 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-22
Asserted: 2026-09-22
Scope
Notes: Affected: F5 / BIG-IP | Description: Unauthenticated RCE vulnerability present when BIG-IP APM is configured as an OAuth Authorization Server. | Exploitation type: unknown | CWEs: CWE-122 | Origin source: ENISA | Notes: https://my.f5.com/manage/s/article/K000162605
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-122
Euvd EUVD-2026-84427
Notes https://my.f5.com/manage/s/article/K000162605
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product BIG-IP
Datereported 2026/09/22
Originsource ENISA
Patchedsince
Vendorproject F5
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-09-23 20:00 UTC | Updated: 2026-09-23 20:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 63a81856-fc36-4af7-bc00-5646a149e8a8

Vulnerability ID: CVE-2026-94127

Status: Confirmed

Status Updated: 2026-09-22 16:21 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-22
Asserted: 2026-09-22
Scope
Notes: BIG-IP APM OAuth vulnerability | Affected: F5 / BIG-IP | CVSS: 9.3 (CRITICAL) | EPSS: 0.01391 | Used in malware: unknown | Listed 3 hours ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title BIG-IP APM OAuth vulnerability
Cve Id CVE-2026-94127
Vendor F5
Ghsa Id GHSA-QPPV-6JRG-HXQ4
Product BIG-IP
Added Date 2026-09-22T16:21:00.000Z
Cvss Score 9.3
Epss Score 0.01391
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.71171
Used In Malware unknown
Vulnerability Id CVE-2026-94127
Ahead Of Cisa Kev 
{
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  "unit": "hour"
}
Not Yet In Cisa Kev False
References
Created: 2026-09-23 17:00 UTC | Updated: 2026-09-23 17:00 UTC
Show details on NVD website
To clipboard 

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}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.