CVE-2026-76418: Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability
Cisco Secure Firewall ASA Software and Cisco Secure FTD Software contains an unchecked return value to NULL pointer dereference vulnerability that could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition.
- Published by source
- 2026-10-29
- First seen by Reality Radar
- 2026-10-29
- Last verified
- 2026-10-29
Affected
- Manufacturer
- Cisco
- Products
- Secure Firewall ASA Software and Cisco Secure FTD Software Cisco Secure Firewall ASA Software and Cisco Secure FTD Software
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
What the official notice says
Risk: Actively exploited in the wild
Remedy / actions:
- 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.
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- CISA Known Exploited Vulnerabilities Tier A · official published 2026-10-29
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #2993 | new | 2026-10-29 | fd39b20df882…e681b2 | f6c1aa8da500…f745fb |
Chain head: #3001 80f323478457…4b8d7a