Quick answers
- Is CVE-2026-42023 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42023 being exploited in the wild.
- How severe is CVE-2026-42023?
- Critical severity, with a CVSS score of 9.1, published 20 October 2026.
- Which products and versions are affected?
- TOTOLINK X2000r TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.
- Is there a fix for CVE-2026-42023?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-42023 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-42023?
- Check whether you run TOTOLINK X2000r at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
Stack-based buffer overflow vulnerabilities (CWE-121) exist in the formIpv6Setup function of the boa web server on Totolink X2000R, affecting parameters including static_dns1, static_dns2, and static_ipv6, which are copied to the stack without bounds checking. An authenticated attacker can trigger arbitrary code execution via a specially crafted HTTP request, as confirmed by crash data showing controlled return address hijacking (pc = 0x42424242).
Affected products
- Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
Timeline
- 2026-10-20: disclosed