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TI-2026-77042 Aliases CVE-2026-42025GHSA-j7w9-w54x-hg57

Stack-based buffer overflow in TOTOLINK X2000R router web interface

Priority MEDIUM 42CWE-121Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

CVE-2026-42025 (GHSA-j7w9-w54x-hg57) is a stack-based buffer overflow (CWE-121) in the dhcp_dns functionality of the boa formIpv6Setup handler in TOTOLINK X2000R, version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. The flaw concerns the dhcp_dns1 parameter. A specially crafted HTTP request can lead to arbitrary code execution, and the attacker must send it as an authenticated HTTP request. The CVSS 3.1 base score is 9.1 (CRITICAL).

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Multiple exploitable stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup dhcp_dns functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the dhcp_dns1 parameter.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00512 43rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TOTOLINKTotolinkTOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327—No fix listedCNA
  • Totolink VendorTOTOLINK Affected TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for TOTOLINK X2000R.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-42025
  2. 2026-10-21 Alias added: GHSA-j7w9-w54x-hg57
  3. 2026-10-23 CISA SSVC decision points changed
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

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