Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-71940— DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Edit ACE

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.

多个DrayTek VigorSwitch型号中存在缓冲区溢出漏洞，该漏洞位于 acl_general_setup 函数的“Edit ACE”（编辑访问控制条目）功能中。此漏洞的成因是在将 name 字段复制到固定大小的缓冲区时未进行长度验证。远程攻击者可通过构造恶意输入触发该漏洞，从而导致拒绝服务（DoS），甚至可能执行任意命令。但要利用此漏洞，攻击者必须拥有该设备 Web 管理界面的有效管理员凭据。

CVSS 7.2 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-71940

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
DrayTek VigorSwitch Multiple Models Buffer Overflow via acl_general_setup Edit ACE
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the acl_general_setup Edit ACE function. The vulnerability is caused by copying the name field into a fixed-size buffer without length validation. 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

Vendor Product Affected Versions CPE Subscribe
DrayTek Corporation VigorSwitch G2540xs 0 ~ 3.9.10 -
DrayTek Corporation VigorSwitch P2540xs 0 ~ 3.9.10 -
DrayTek Corporation VigorSwitch FX2120 0 ~ 3.9.10 -
DrayTek Corporation VigorSwitch G2282x 0 ~ 2.10.6 -
DrayTek Corporation VigorSwitch P2282x 0 ~ 2.10.6 -
DrayTek Corporation VigorSwitch Q2300x 0 ~ 2.10.7 -
DrayTek Corporation VigorSwitch PQ2300xb 0 ~ 2.10.7 -
DrayTek Corporation VigorSwitch G2542x 0 ~ 3.10.6 -
DrayTek Corporation VigorSwitch P2542x 0 ~ 3.10.6 -
DrayTek Corporation VigorSwitch P2542xh 0 ~ 3.10.6 -
DrayTek Corporation VigorSwitch PX2060 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G1280 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P1280 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P1281x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G1282 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P1282 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2121 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2121 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch PQ2121x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch Q2121x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2280x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2280x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch Q2200x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch PQ2200xb 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2100 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2100 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch G2540x 0 ~ 2.9.10 -
DrayTek Corporation VigorSwitch P2540x 0 ~ 2.9.10 -

II. Public POCs for CVE-2026-71940

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-71940

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-71940 (2)

Same Patch Batch · DrayTek Corporation · 2026-08-24 · 39 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-2026-71915 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via jsonstatus
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-2026-71934 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via pingtrace
CVE-2026-71918 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via webBackupAction
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-2026-71941 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via diag_logmail
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-2026-71924 7.2 HIGH DrayTek VigorSwitch Multiple Models OS Command Injection via getVid
CVE-2026-71937 7.2 HIGH DrayTek VigorSwitch Multiple Models Buffer Overflow via poe_schedule_profile

Showing top 20 of 39 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: VigorSwitch G2540xs
Same vendor: DrayTek Corporation
Same weakness: CWE-120

V. Comments for CVE-2026-71940

No comments yet

Leave a comment