CVE-2017-17901 — ZyXEL P-660HW v3 devices allow remote attackers to cause a denial of service (CP

ZyXEL P-660HW v3 devices allow remote attackers to cause a denial of service (CPU consumption) via a flood of IP packets with a TTL of 1.

01What is this vulnerability?

ZyXEL P-660HW v3 devices allow remote attackers to cause a denial of service (CPU consumption) via a flood of IP packets with a TTL of 1.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2017-12-29T22:29:00.677
• Last modified: 2026-05-13T00:24:29.033

09References

• packetstormsecurity.com — http://packetstormsecurity.com/files/145548/ZyXEL-P-660HW-TTL-Expiry-Denial-Of-S…
• www.zyxel.com — https://www.zyxel.com/support/announcement_denial_of_service.shtml
• packetstormsecurity.com — http://packetstormsecurity.com/files/145548/ZyXEL-P-660HW-TTL-Expiry-Denial-Of-S…
• www.zyxel.com — https://www.zyxel.com/support/announcement_denial_of_service.shtml