Exploited vulnerability · CISA KEV

Is CVE-2017-18368 exploited? Yes: in CISA KEV since 7 Aug 2023

Gociux · Zyxel P660HN-T1A Routers · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-18368, Zyxel P660HN-T1A Routers Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 7 Aug 2023, 1558 days after it was published. It affects Zyxel P660HN-T1A Routers, 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

Zyxel P660HN-T1A routers contain a command injection vulnerability in the Remote System Log forwarding function, which is accessible by an unauthenticated user and exploited via the remote_host parameter of the ViewLog.asp page.

What to do

1. Check whether you run it. Look for P660HN-T1A Routers 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 2 May 2019.
4. Get told next time. Email alerts when CISA adds a CVE for Zyxel.

References

• www.zyxel.com/global/en/support/security-advisories/zyxel-security-adviso
• www.zyxel.com/global/en/support/security-advisories/zyxel-security-adviso
• nvd.nist.gov/vuln/detail/CVE-2017-18368

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 August 2023 · Zyxel scorecard · act-now radar.