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

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-19814— TOTOLINK A800R firewall.so cstecgi.cgi setMacQos stack-based overflow

Quick assessment

Affected
TOTOLINK A800R
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TOTOLINK A800R是中国TOTOLINK公司的一款无线路由器。 TOTOLINK A800R 4.1.2cu.5137_B20200730版本存在缓冲区错误漏洞，该漏洞源于对/cgi-bin/cstecgi.cgi文件中setMacQos函数的macAddress参数操作不当，导致栈缓冲区溢出，攻击者可能远程利用该漏洞。

CVSS 8.8 · High EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
TOTOLINK A800R 4.1.2cu.5137_B20200730 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-19814

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
TOTOLINK A800R firewall.so cstecgi.cgi setMacQos stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setMacQos of the file /cgi-bin/cstecgi.cgi of the component firewall.so. Performing a manipulation of the argument macAddress results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK A800R 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A800R是中国TOTOLINK公司的一款无线路由器。 TOTOLINK A800R 4.1.2cu.5137_B20200730版本存在缓冲区错误漏洞，该漏洞源于对/cgi-bin/cstecgi.cgi文件中setMacQos函数的macAddress参数操作不当，导致栈缓冲区溢出，攻击者可能远程利用该漏洞。
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
TOTOLINK A800R 4.1.2cu.5137_B20200730 cpe:2.3:o:totolink:a800r_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19814

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8432 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-19814

请登录查看更多情报信息。

News Coverage for CVE-2026-19814 (1)

Same Patch Batch · TOTOLINK · 2026-08-14 · 9 CVEs total

CVE-2026-19811 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setIpQosRules stack-based overflow
CVE-2026-19812 8.8 HIGH TOTOLINK A800R product.so cstecgi.cgi UploadCustomModule stack-based overflow
CVE-2026-19813 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setMacFilterRules stack-based overflow
CVE-2026-19815 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setParentalRules stack-based overflow
CVE-2026-19844 8.8 HIGH TOTOLINK A800R ipv6.so cstecgi.cgi setRadvdCfg stack-based overflow
CVE-2026-19845 8.8 HIGH TOTOLINK A800R lan.so cstecgi.cgi setStaticDhcpConfig stack-based overflow
CVE-2026-19846 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow
CVE-2026-19847 8.8 HIGH TOTOLINK A800R wps.so cstecgi.cgi setWiFiWpsConfig stack-based overflow

IV. Related Vulnerabilities

Same product: A800R
Same vendor: TOTOLINK
Same weakness: CWE-121

V. Comments for CVE-2026-19814

No comments yet

Leave a comment