Retrospective for 2026-09-23, compiled on 27 October 2026. The date identifies the day being analysed; source publication and revision dates are recorded below.
What this advisory changes in your environment
The starting point is CERTFR-2026-AVI-1220, published on 2026-09-23. Its scope includes BIG-IP APM. Reported consequences are remote code execution. These statements apply to the advisory’s scope; they do not assign every consequence to every product or CVE.
This case focuses on BIG-IP APM. Locate that edition in live installations, deployment images and actual dependencies, rather than treating every product from F5 as equivalent.
Products and versions to examine
- Reference
- CERTFR-2026-AVI-1220
- Source first published
- 2026-09-23
- Latest source revision available for this day
- 2026-09-23
- Named components
- BIG-IP APM
- CVE identifiers
- CVE-2026-94127
| Component | Published condition |
|---|---|
| BIG-IP APM | 17.1.x : < 17.1.3 missing patch Hotfix-BIGIP 17.1.3.5.0.41.14-ENG.iso |
| BIG-IP APM | 21.x : < 21.1.0 missing patch Hotfix-BIGIP-21.1.0.2.0.30.22-ENG.iso |
| BIG-IP APM | 17.5.x : < 17.5.1 missing patch Hotfix-BIGIP-17.5.1.9.0.160.12-ENG.iso |
For BIG-IP APM, the published condition is “17.1.x : < 17.1.3 missing patch Hotfix-BIGIP 17.1.3.5.0.41.14-ENG.iso”. Compare the version actually loaded with that condition within its own release branch. A fix installed on another edition of BIG-IP APM does not close this case.
Mechanism and prerequisites
Code execution can give an attacker the permissions of the affected process. Check the service account and reachable network destinations. Component isolation can reduce lateral movement opportunities, but does not replace the fix.
The primary record CVE-2026-94127, published by f5, covers BIG-IP. The retained revision is dated 2026-09-23. Its scope is presented separately from the integrations and product groupings in CERTFR-2026-AVI-1220.
The published metric for CVE-2026-94127 is CVSS 3.1, 9.8/10. The vector below describes technical prerequisites; it does not measure attack frequency or the likelihood that your deployment is compromised.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- network
- Prior privileges
- none
- User interaction
- none
- Complexity
- low
- Weakness
- CWE-122
Choose the appropriate intervention
- Locate BIG-IP APM instances, running releases and service owners. Record condition 17.1.x : < 17.1.3 missing patch Hotfix-BIGIP 17.1.3.5.0.41.14-ENG.iso in the ticket alongside reference CERTFR-2026-AVI-1220.
- Compare the installed branch with the vendor’s BIG-IP APM release notes. Prepare the package for that branch and a dependent-service test, retaining the pre-change state.
- After changing BIG-IP APM, capture the loaded version again and verify the workflow below. Any exception needs an owner, an exposure-reduction measure and an expiry date.
Verify the fix in a real workflow
Validation scenario to adapt for BIG-IP APM: For BIG-IP APM, test an authorised business flow from each zone reaching the service and confirm management restrictions. If a redundant pair exists, verify both nodes and rule persistence after failover during a planned maintenance window. This is a proposed defensive check, not a claim that testing was performed against third-party systems.
Limit of case CERTFR-2026-AVI-1220: this analysis replaces neither vendor prerequisites nor investigation of your logs. Only documented versions are reproduced; no attack date or victim is invented.
Questions specific to this case
Which condition should be checked for BIG-IP APM?
Advisory CERTFR-2026-AVI-1220 states: BIG-IP APM — 17.1.x : < 17.1.3 missing patch Hotfix-BIGIP 17.1.3.5.0.41.14-ENG.iso. Check the edition and running release; do not extend the published boundary to branches absent from the advisory.
Which prerequisites does record CVE-2026-94127 specify?
For CVE-2026-94127, the published vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Verify those conditions on BIG-IP before applying them to an integration named in CERTFR-2026-AVI-1220.
Sources and related reading
Practical guide : Software inventory: prepare for end of support
Explore the decision addressed in this case
- Citrix NetScaler ADC, NetScaler Gateway: contain code execution
- FortiSIEM, FortiMonitorOnSight: contain code execution
Complete source advisory inventory
The article table may be an extract. These lists contain every affected-system entry and CVE in the specified advisory revision. They are not an inventory of your assets and do not map every CVE to every product.
Official source · CERTFR-2026-AVI-1220
Advisory revision : · Checked on :
Affected systems · 3
Original French wording is retained to avoid ambiguous translations of version conditions.
- BIG-IP APM versions 17.1.x antérieures à 17.1.3 sans le correctif Hotfix-BIGIP 17.1.3.5.0.41.14-ENG.iso
- BIG-IP APM versions 21.x antérieures à 21.1.0 sans le correctif Hotfix-BIGIP-21.1.0.2.0.30.22-ENG.iso
- BIG-IP APM versions 17.5.x antérieures à 17.5.1 sans le correctif Hotfix-BIGIP-17.5.1.9.0.160.12-ENG.iso