---
title: "Security digest: November 27, 2024"
url: https://erroneo.us/security/2024-11-27/
description: "November 27, 2024 vulnerability digest: 1 brief (Zyxel Firewall CVE-2024-11667: Helldown…). What to patch and who can relax."
type: security-digest-day
section: "Security Digest"
date_published: 2024-11-27
date_modified: 2026-10-23
publisher: erroneo.us
author: erroneo.us Security Desk
license: All rights reserved. Quote with attribution and a link.
---

# Security digest: November 27, 2024

1 editorial brief.

## Take stock

- Check exposure: Zyxel Firewall CVE-2024-11667: Helldown Ransomware Entry . Owners of Zyxel ATP, USG FLEX, USG FLEX 50(W) or USG20(W)-VPN firewalls in on-premises mode that ran ZLD 5.38 or older with remote management or SSL VPN enabled.
- None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

## Editorial briefs

- **Check exposure** [Zyxel Firewall CVE-2024-11667: Helldown Ransomware Entry](https://erroneo.us/security/briefs/zyxel-firewall-cve-2024-11667-path-traversal-helldown/index.md): The fix shipped in September 2024, but stolen firewall credentials outlive the patch: confirm ZLD 5.39 or later, then make sure every credential was rotated after the upgrade and no rogue VPN users remain.

## Known exploited (CISA KEV)

None.

## Critical advisories

None.

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Source page: https://erroneo.us/security/2024-11-27/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt