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TI-2026-86502 Aliases CVE-2026-123960GHSA-gmwv-c623-rw5f

Buffer overflow in TOTOLINK CA300-PoE cstecgi.cgi setWanConfig

Priority MEDIUM 42CWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A weakness in TOTOLINK CA300-PoE 6.2c.884 affects the setWanConfig function of the /cgi-bin/cstecgi.cgi file. Manipulating the pppoeUser, priDns or secDns argument can cause a buffer overflow (CWE-119). A remote attacker can launch the attack, and a public exploit is available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

A weakness has been identified in TOTOLINK CA300-PoE 6.2c.884. This affects the function setWanConfig of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument pppoeUser/priDns/secDns can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.

Why it matters now

EPSS 0.00796 56th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TOTOLINKCA300-PoE6.2c.884—No fix listedCNA
  • CA300-PoE VendorTOTOLINK Affected 6.2c.884 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:o:totolink:ca300-poe_firmware:*:*:*:*:*:*:*:*——TOTOLINK
  • cpe:2.3:o:totolink:ca300-poe_firmware:*:*:*:*:*:*:*:* Versions — — ·TOTOLINK

Remediation

The sources list no fixed version for TOTOLINK CA300-PoE.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Timeline

  1. 2026-11-07 Threatist record created from CVE-2026-123960
  2. 2026-11-07 Alias added: GHSA-gmwv-c623-rw5f

References

Exploit 1

Other 1

  • TI-2023-25090 An issue in TOTOLINK A3700R v.9.1.2u.6165_20211012 allows a remote attacker to execute… CVSS 3.1CRITICAL 9.8
  • TI-2026-80926 TOTOLINK A950RG stack-based overflow in infostat.cgi via CONTENT_LENGTH CVSS 4.0CRITICAL 10.0
  • TI-2026-79142 Command injection in TOTOLINK A950RG UploadCustomModule function CVSS 4.0CRITICAL 10.0
  • TI-2026-79031 TOTOLINK EX200 setWiFiAclAddConfig stack-based buffer overflow CVSS 4.0CRITICAL 10.0
  • TI-2026-79012 Stack-based buffer overflow in TOTOLINK EX200 setStaticDhcpConfig CVSS 4.0CRITICAL 10.0
  • TI-2026-67719 Stack-based overflow in Totolink A3002MU QoS rule handler CVSS 4.0CRITICAL 10.0
See all 1321 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences