Vulnerability · Published Aug 14, 2026 · Assigned by VulDB
CVE-2026-19846TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow
High 8.8
In plain English
A high-severity stack buffer overflow in A800R from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.9%top 41.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A vulnerability was identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument url leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might be used.
Affected products (as reported)
Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
References
- VDB-389982 | TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow vdb-entry, technical-description
- VDB-389982 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- CVE-2026-19846 | CVE Analysis and Report third-party-advisory
- Submit #869456 | Totolink A800R V4.1.2cu.5137_B20200730 Buffer Overflow third-party-advisory
- https://github.com/panda666-888/vuls/blob/main/totolink/a800r/setUrlFilterRules.md exploit
- https://www.totolink.net/ product