Zyxel Switch: zero-day exploit

Zyxel GS1900 switches

Zyxel Switch hacks blamed on patched flaw actually exploited a zero-day out-of-bounds write flaw.

Do this now

Check the Zyxel advisory for a fix for the GS1900 switch flaw, and restrict management access to the switches meanwhile.

Who should check: teams running VPN & firewalls

First seen: 5 Nov 2026
Last update: 5 Nov 2026, 12:17 UTC
Identifiers: CVE-2026-107441
CVSS: 8.8
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.

## Zyxel Switch: zero-day exploit
Severity: high. Patch status: fix status unknown.
Affected: Zyxel GS1900 switches
Ids: CVE-2026-107441

Zyxel Switch hacks blamed on patched flaw actually exploited a zero-day out-of-bounds write flaw.

## 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.
2. No source names a fix yet; check the vendor advisory. Until one ships: restrict network access to it.

## 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-2026-107441") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://www.securityweek.com/zyxel-switch-hacks-blamed-on-patched-flaw-actually-exploited-a-zero-day/ https://www.helpnetsecurity.com/2026/11/05/zyxel-cve-2026-107441-exploit/ https://www.infosecurity-magazine.com/news/zyxel-gs1900-patch-missed-flaw/
https://pwned.coffee/i/zyxel-switch-zero-day-exploit-cve-2026-107441

Timeline

5 Nov 2026, 12:17 UTC
Reported by helpnetsecurity.com: Patched Zyxel GS1900 switches remained open to in-the-wild exploit (CVE-2026-107441)
5 Nov 2026, 11:18 UTC
Fix status: no fix yet → unknown.
5 Nov 2026
First reported.

Receipt

Exploitation: No known exploitation
Overheard “A recently patched vulnerability in Zyxel GS1900 series switches was exploited in the wild as a zero-day to hack almost 1,000 devices, cybersecurity firm Binarly reports.” source
Overheard “Zeljka Zorz , Editor-in-Chief, Help Net Security November 5, 2026 Patched Zyxel GS1900 switches remained open to in-the-wild exploit (CVE-2026-107441) Zyxel GS1900 series network switches that received a fix for a flaw that was later reported to have been exploited in the wild…” source
Score: CVSS 8.8 (high). CVSS 3.1 8.8 (CNA Zyxel) for CVE-2026-107441
Last checked: 6 Nov 2026, 12:18 UTC

Sources: KEV – CVE record ✓ Vendor –

Sources

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