CVE-2026-18321: Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd
Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-18321
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-183210.08% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 0% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-18321 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Buffer overflow in
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownCVE-2026-67305: FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clip…nvd · 2026-08-01
- highCVE-2026-67298: FreeRDP versions 3.28.0 and earlier contain a heap buffer overflow in the server-side RAIL cha…nvd · 2026-08-01
- criticalCVE-2026-67822: Tenda W6-S 1.0.0.4(510) contains a stack-based buffer overflow vulnerability in the /goform/wi…nvd · 2026-07-31
- highCVE-2026-15722: A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruveleme…nvd · 2026-07-31
- highCVE-2026-10535: IBM Db2 11.5.0 through 11.5.9, and 12.1.0 through 12.1.4 is vulnerable to buffer overflow in s…nvd · 2026-07-30
- unknownCVE-2026-67248: A stack-based buffer overflow vulnerability was found in the File Explorer on the ADM. The vul…nvd · 2026-07-30
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