CVE-2026-71941— DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail
Quick assessment
Affected
DrayTek Corporation VigorSwitch G2540xs
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.
以下是对该漏洞描述信息的中文翻译： DrayTek VigorSwitch 多款交换机型号在 函数中存在缓冲区溢出漏洞。该漏洞的成因是在将多个 SMTP 接收方邮件地址拼接到一个固定大小的缓冲区时，未检查缓冲区剩余空间。远程攻击者可通过构造恶意输入触发此漏洞，从而导致拒绝服务（DoS），或在某些情况下执行任意命令。然而，利用此漏洞需要攻击者具备设备 Web 管理界面的有效管理员凭证。
Possible ATT&CK Techniques 3 AI
T1210 · Exploitation of Remote Services T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of ServiceAffected Version Matrix 28
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I. Basic Information for CVE-2026-71941
Vulnerability Information
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Vulnerability Title
DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the diag_logmail function. The vulnerability is caused by concatenating multiple smtpReceiver email addresses into a fixed-size buffer without checking the remaining buffer size. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/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
Affected Products
II. Public POCs for CVE-2026-71941
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-71941 (1)
Other References for CVE-2026-71941 (1)
Same Patch Batch · DrayTek Corporation · 2026-08-24 · 40 CVEs total
| CVE-2026-71914 | 9.8 CRITICAL | DrayTek VigorAP Multiple Models Pre-Authentication OS Command Injection via dray_apm |
| CVE-2026-71921 | 9.8 CRITICAL | DrayTek VigorSwitch Multiple Models Pre-Authentication OS Command Injection via setget.cgi |
| CVE-2026-71933 | 9.1 CRITICAL | DrayTek VigorSwitch Multiple Models Missing Authorization in Syslog Functions |
| CVE-2026-71922 | 7.5 HIGH | DrayTek VigorSwitch Multiple Models Pre-Authentication NULL Pointer Dereference via setget |
| CVE-2026-71934 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models Buffer Overflow via pingtrace |
| CVE-2026-71905 | 7.2 HIGH | DrayTek VigorAP Multiple Models OS Command Injection via ExportSettings |
| CVE-2026-71919 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models OS Command Injection via sysreboot |
| CVE-2026-71910 | 7.2 HIGH | DrayTek VigorAP Multiple Models OS Command Injection via apautotest |
| CVE-2026-71906 | 7.2 HIGH | DrayTek VigorAP Multiple Models OS Command Injection via setLan |
| CVE-2026-71912 | 7.2 HIGH | DrayTek VigorAP Multiple Models Buffer Overflow via apautotest |
| CVE-2026-71917 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models OS Command Injection via pingtrace |
| CVE-2026-71907 | 7.2 HIGH | DrayTek VigorAP Multiple Models OS Command Injection via setcamset |
| CVE-2026-71925 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models OS Command Injection via getDetail |
| CVE-2026-71915 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models OS Command Injection via jsonstatus |
| CVE-2026-71923 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models OS Command Injection via auth_set |
| CVE-2026-71935 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models Buffer Overflow via webBackupAction |
| CVE-2026-71938 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models Buffer Overflow via switch_lan_gvrp |
| CVE-2026-71939 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Add ACE |
| CVE-2026-71918 | 7.2 HIGH | DrayTek VigorSwitch Multiple Models OS Command Injection via webBackupAction |
| CVE-2026-71909 | 7.2 HIGH | DrayTek VigorAP Multiple Models OS Command Injection via InquierTime |
Showing top 20 of 40 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: VigorSwitch G2540xs
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CVE-2026-71943
DrayTek VigorSwitch Multiple Models OS Command Injection via -
CVE-2026-71942
DrayTek VigorSwitch Multiple Models Buffer Overflow via mail -
CVE-2026-71940
DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_ -
CVE-2026-71938
DrayTek VigorSwitch Multiple Models Buffer Overflow via swit -
CVE-2026-71939
DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_
Same vendor: DrayTek Corporation
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CVE-2026-71943
DrayTek VigorSwitch Multiple Models OS Command Injection via -
CVE-2026-71942
DrayTek VigorSwitch Multiple Models Buffer Overflow via mail -
CVE-2026-71940
DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_ -
CVE-2026-71938
DrayTek VigorSwitch Multiple Models Buffer Overflow via swit -
CVE-2026-71939
DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_
Same weakness: CWE-120
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Bluez: stack overflow in name2utf8 causes dos and potential -
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Adobe XD | Buffer Overflow (CWE-120) -
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File-roller: file-roller: stack buffer overflow in parse_pro -
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SVG File Parsing Memory Corruption Vulnerability in Autodesk -
CVE-2026-71942
DrayTek VigorSwitch Multiple Models Buffer Overflow via mail
V. Comments for CVE-2026-71941
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