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  4. CVE 2026 123959 totolink ca300 poe cstecgicgi setlanguagecfg
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Back to active CVEs
Critical · CVSS 9.4CVE-2026-123959

TOTOLINK CA300-PoE cstecgi.cgi setLanguageCfg buffer overflowCVE-2026-123959

Answer in brief

CVE-2026-123959 records a Critical severity (CVSS 9.4) vulnerability in TOTOLINK CA300-PoE cstecgi.cgi setLanguageCfg buffer overflow. The current sources do not mark it as known exploited. The current feed maps TOTOLINK/CA300-PoE (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 Nov 7, 2026Updated Nov 7, 2026Source checked Nov 7, 2026First seen by HOL Nov 7, 2026Material review Nov 7, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
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 9.4. 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/CA300-PoE (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
TOTOLINK/CA300-PoEgeneric6.2c.884Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for TOTOLINK/CA300-PoE.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 7, 2026

Sources and claim methodology

  • Source referencelavender-bicycle-a5a.notion.site
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencetotolink.net
Upstream source description

A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. The impacted element is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument langType results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • TOTOLINK CA300-PoE cstecgi.cgi setWanConfig buffer overflowSame totolink/ca300-poe package
  • TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflowSame totolink/ca300-poe package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-120, CWE-119
Source
CVE List V5
Source checked
Nov 7, 2026
References
6 linked sources
Open source record