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CVE-2026-18321— Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in ntpsec

Quick assessment

Affected
NTPsec ntpsec
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NTPsec是NTPsec组织开源的一套更安全的网络时间协议实现。 NTPsec 1.2.5之前版本存在缓冲区错误漏洞，该漏洞源于Zyfer refclock存在缓冲区溢出，可能导致本地攻击者使ntpd崩溃。

CVSS 4.7 · Medium EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
NTPsec ntpsec < 1.2.5 affected
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I. Basic Information for CVE-2026-18321

Vulnerability Information
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Vulnerability Title
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in ntpsec
Source: CVE Program / CVE List V5
Vulnerability Description
Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
NTPsec 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NTPsec是NTPsec组织开源的一套更安全的网络时间协议实现。 NTPsec 1.2.5之前版本存在缓冲区错误漏洞，该漏洞源于Zyfer refclock存在缓冲区溢出，可能导致本地攻击者使ntpd崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NTPsec ntpsec 0 ~ 1.2.5 -

II. Public POCs for CVE-2026-18321

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III. Intelligence Information for CVE-2026-18321

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Other References for CVE-2026-18321 (1)

IV. Related Vulnerabilities

Same product: ntpsec
Same vendor: NTPsec
Same weakness: CWE-120

V. Comments for CVE-2026-18321

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