Called exploited the same day it was disclosed.
Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.
The life of this vulnerability
- CVE reserved
- CVE published2mo
- First KEV listingsame day
- Last KEV listing1d
- Last sighting1d
Gaps are compressed to equal steps. The elapsed time is printed under each.
Which catalogues call it exploited
- CISA KEVUS federallisted Oct 29, 2026
- EUVDENISA, European Unionlisted Oct 29, 2026
- VulnCheck KEVcommercial researchlisted Oct 28, 2026
- CIRCLaggregator, mirrors the abovelisted Oct 28, 2026, not counted
3 catalogues list it. CIRCL aggregates the others and is shown but not counted.
Public exploitation evidence
- reported exploitationsec.cloudapps.cisco.com/security/center/content/CiscoSecurit
1 public report collected from VulnCheck and CIRCL, first on Oct 28, 2026. Each links to its original source. We have not verified them.
Description
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.
Required action (CISA)
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.