Exploited vulnerability · CISA KEV

Is CVE-2024-11667 exploited? Yes: in CISA KEV since 3 Dec 2024

Gociux · Zyxel Multiple Firewalls · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-11667, Zyxel Multiple Firewalls Path Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Dec 2024, 6 days after it was published. It is known to be used in ransomware campaigns. It affects Zyxel Multiple Firewalls, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it is

Multiple Zyxel firewalls contain a path traversal vulnerability in the web management interface that could allow an attacker to download or upload files via a crafted URL.

What to do

1. Check whether you run it. Look for Multiple Firewalls in your asset inventory, including appliances and cloud images. Stack check lists every exploited Zyxel CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Nov 2024.
4. Get told next time. Email alerts when CISA adds a CVE for Zyxel.

Other exploited CVEs in Multiple Firewalls

• CVE-2023-33009: Zyxel Multiple Firewalls Buffer Overflow Vulnerability (5 Jun 2023)
• CVE-2023-33010: Zyxel Multiple Firewalls Buffer Overflow Vulnerability (5 Jun 2023)
• CVE-2023-28771: Zyxel Multiple Firewalls OS Command Injection Vulnerability (31 May 2023)
• CVE-2022-30525: Zyxel Multiple Firewalls OS Command Injection Vulnerability (16 May 2022)

References

• www.zyxel.com/global/en/support/security-advisories/zyxel-security-adviso
• nvd.nist.gov/vuln/detail/CVE-2024-11667

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in December 2024 · Zyxel scorecard · act-now radar.