TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow (CVE-2026-19846) | HOL Guard CVE

High · CVSS 8.8CVE-2026-19846

TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow

Answer in brief

CVE-2026-19846 records a High severity (CVSS 8.8) vulnerability in TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow. The current sources do not mark it as known exploited. The current feed maps TOTOLINK/A800R (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 14, 2026Updated Aug 14, 2026Source checked Sep 29, 2026First seen by HOL Aug 14, 2026Material review Aug 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TOTOLINK/A800R (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TOTOLINK/A800Rgeneric	4.1.2cu.5137_B20200730	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for TOTOLINK/A800R.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 14, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.