F5 · Memory corruption
F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
At a glance
Actively exploited in the wild — prioritise confirming exposure.
High rather than Critical: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on F5 BIG-IP Access Policy Manager, treat it as Critical.
Briefing
- Do not treat uncorroborated claims as confirmed breaches.
Questions to ask IT
- Do we run F5 BIG-IP Access Policy Manager, and which versions?
- Is any of it reachable from the internet?
- Have we checked whether it has already been used against us?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 14 Nov?
Next steps
- Confirm exposure and remediation status for affected products
Vulnerability facts
Full CVE detail CVE-2026-94127- 9.3 · CriticalExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.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
- Listed: attacks using it have been seen
- Elevated attack likelihood (~26.6% in 30 days)
No technical write-up beyond these facts and the summary below yet.
Next steps
- Confirm whether affected products/versions are present and prioritise patching or mitigations
Summary
- CVE-2026-94127 has an estimated ~24.9% chance of attack in 30 days (97.9th percentile) as of 2026-10-25 — probability signal, not confirmed exploitation
- CVE-2026-94127 is confirmed as exploited in the wild (US known-exploited catalogue)
- Authoritative catalogues report active exploitation of this vulnerability.
Products and services involved
- F5 BIG-IP Access Policy Manager93% match confidence · CVE-2026-94127
Part of F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
Pulse
Last checked 55m ago · Next recheck 14 Nov 2026, 14:04 UK time · 1 quiet check collapsed
- Story26 Oct 2026, 08:07 UK time · 26 Oct
Linked reporting from (official standard body).
Read source (FIRST EPSS) - Update13 Nov 2026, 14:04 UK time · 55m ago
held at 24.9%; ranking metadata was updated.
2 entries so far. The timeline chart appears once this story has more history.
Sources
CVE-2026-94127: elevated exploitation probability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
- ProbableSummary fact75% confidence
CVE-2026-94127 has an estimated attack likelihood score of 0.249 (~24.9% estimated chance of exploitation in the next 30 days; 97.9th percentile) as of 2026-10-25. This is a probability signal from FIRST, not confirmed exploitation.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-94127
- ConfirmedKnown-exploited catalogue98% confidence
CVE-2026-94127 is confirmed as exploited in the wild (US known-exploited catalogue)
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-94127 has an estimated ~24.9% chance of attack in 30 days (97.9th percentile) as of 2026-10-25 — probability signal, not confirmed exploitation