Quick answers
- Is CVE-2026-9869 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9869 being exploited in the wild.
- How severe is CVE-2026-9869?
- 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-2026-9869?
- 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-2026-9869 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-9869?
- 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
The formTR069Config() function in the boa web server reads a password parameter from an HTTP POST request and, after basic validation (spaces and non-ASCII checks), writes it to flash storage and then reads it back into a fixed-size stack buffer of 0xF8 bytes. Since the MIB_TR069_PASSWORD maximum length exceeds this buffer size, an attacker can overflow the stack with a crafted password value. Authentication is required, and the attack is triggered via an HTTP request to /boafrm/formTR069Config.
Affected products
- TOTOLINK X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
Timeline
- 2026-10-20: disclosed