Denial-of-Service Vulnerabilities Disrupting Network Perimeter and Wi‑Fi Infrastructure
A DoS vulnerability in Palo Alto Networks PAN-OS tracked as CVE-2024-3393 was reported as actively exploited in the wild, allowing unauthenticated remote attackers to send specially crafted DNS packets that can force affected firewalls to reboot and, with repeated triggering, potentially enter maintenance mode, effectively disabling perimeter enforcement. Reported impact is tied to the data plane when DNS Security is enabled and DNS Security logging is active, and it may affect multiple form factors (including PA-Series, VM-Series, CN-Series, and Prisma Access) where the DNS Security license is applied; advisories urge rapid patching/mitigation due to the risk of losing network security controls.
Separately, researchers disclosed a Broadcom chipset software flaw affecting at least the ASUS RT-BE86U that enables an unauthenticated, in-range attacker on 5 GHz Wi‑Fi to send a single malformed frame that immediately disconnects clients, requiring a manual router reset; the issue was found via fuzzing, fixed by Broadcom, and addressed by ASUS in updated firmware (reported fixed in 3.0.0.6.102_37841, affecting 3.0.0.6.102_37612 and older). A Palo Alto Networks advisory on a Chromium monthly vulnerability update lists multiple Chromium CVEs incorporated into Palo Alto products, but it is not directly related to the PAN-OS DNS DoS exploitation or the Broadcom/ASUS Wi‑Fi DoS issue.
Timeline
Jan 15, 2026
Palo Alto and CISA publish mitigation guidance for CVE-2024-3393
Palo Alto Networks issued fixed PAN-OS releases and recommended mitigations, including disabling DNS Security logging as a temporary workaround for affected deployments. CISA also warned on the issue and included the vulnerability in its Known Exploited Vulnerabilities catalog.
Jan 15, 2026
Palo Alto PAN-OS DoS flaw CVE-2024-3393 is exploited in the wild
A high-severity denial-of-service vulnerability in Palo Alto Networks PAN-OS, tracked as CVE-2024-3393, was reported as being actively exploited against exposed firewalls. The flaw allows unauthenticated attackers to send crafted DNS packets that can crash the data plane, reboot devices, and potentially push them into maintenance mode.
Jan 14, 2026
Broadcom and ASUS release fixes for affected ASUS router firmware
Broadcom released a fix for the chipset software flaw and ASUS issued updated firmware to address the issue in affected routers. The vulnerable ASUS RT-BE86U firmware includes version 3.0.0.6.102_37612 and older, with a fix available in version 3.0.0.6.102_37841.
Jan 14, 2026
Black Duck discovers Broadcom Wi-Fi DoS flaw affecting ASUS routers
Black Duck disclosed a denial-of-service vulnerability in Broadcom chipset software affecting certain ASUS routers, identified during fuzz testing of the ASUS RT-BE86U. An unauthenticated attacker within 5 GHz Wi-Fi range can send a malformed frame that disconnects all clients and requires a manual router reset to restore connectivity.
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