pwned.coffeeOrder ticket · today's special · 28 Oct 2026

🔥 On the fly · exploited in the wildAmericano · 183°CunknownOrder up · fix available

Cisco Secure Firewall: DoS vulnerability

Cisco Secure Firewall

Vulnerability in Cisco Secure Firewall allows unauthenticated remote attacker to cause device reload

Do this now

Apply the available Cisco fix to Secure Firewall now, since this DoS flaw is being exploited.

First seen: 28 Oct 2026
Last update: 28 Oct 2026, 19:17 UTC
Identifiers: CVE-2026-76418 ID not published yet
Source: news
On the menu as: VPN & firewalls

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Cisco Secure Firewall: DoS vulnerability
Severity: unknown, exploited in the wild. Patch status: patched.
Affected: Cisco Secure Firewall
Ids: CVE-2026-76418

Vulnerability in Cisco Secure Firewall allows unauthenticated remote attacker to cause device reload

## Steps
1. This touches infrastructure (vpn-edge). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-76418") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75?vs_f=Cisco%20Security%20Advisory%26vs_cat=Security%20Intelligence%26vs_type=RSS%26vs_p=Cisco%20Secure%20Firewall%20Adaptive%20Security%20Appliance%20and%20Secure%20Firewall%20Threat%20Defense%20Software%20Remote%20Access%20SSL%20VPN%20Tunnel%20Denial%20of%20Service%20Vulnerability%26vs_k=1
https://pwned.coffee/i/cisco-secure-firewall-dos-vulnerability-cve-2026-76418

Receipt

Exploitation: Exploited: confirmed by the vendor
Vendor “Cisco Secure Firewall ASA Compatibility Cisco Secure Firewall ASA Upgrade Guide Cisco Secure Firewall Threat Defense Compatibility Guide Exploitation and Public Announcements In October 2026, the Cisco PSIRT became aware of active exploitation of this vulnerability.” source
Fix: Cisco has released software updates that address this vulnerability.
Score: No CVSS published yet: severity unknown.
Last checked: 28 Oct 2026, 19:17 UTC

Sources: KEV – CVE record – Vendor ✓

Sources

sec.cloudapps.cisco.com: Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service Vulnerability

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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