# CVE-2026-75012: TOTOLINK EX1200L null pointer dereference in Password Configuration Handler

Source: https://junglewise.ai/threats/cve-2026-75012-totolink-ex1200l-null-pointer-dereference-in-password  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-17. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-75012 · Severity: medium · CVSS 6.5 · Published 2026-08-17

TOTOLINK EX1200L is a wireless router used to provide internet connectivity in homes and small offices. A flaw in the web management interface allows a remote attacker to crash the router's configuration service by sending a specially crafted network request, causing a denial of service that temporarily disables administrative access to the device.

Technologies: [TOTOLINK EX1200L](https://junglewise.ai/threats/technologies/ex1200l). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-75012 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75012 being exploited in the wild.

**How severe is CVE-2026-75012?** Medium severity, with a CVSS score of 6.5, published 17 August 2026.

**Which products and versions are affected?** TOTOLINK EX1200L 9.3.5u.6146_B20201023.

**Is there a fix for CVE-2026-75012?** 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-2026-75012 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-75012?** Check whether you run TOTOLINK EX1200L 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

A null pointer dereference vulnerability exists in the setPasswordCfg function of the Password Configuration Handler (/cgi-bin/cstecgi.cgi) in TOTOLINK EX1200L firmware version 9.3.5u.6146_B20201023. The vulnerable code path fails to validate that required JSON fields (password-related parameters) are present before dereferencing them. An attacker can send a POST request to /cgi-bin/cstecgi.cgi containing only the "topicurl" field set to "setPasswordCfg", omitting mandatory password configuration parameters. The missing fields result in NULL pointer dereference when the code attempts string comparison operations, causing an immediate crash (SIGSEGV). No authentication is required; the attack is remotely exploitable over the network and results in denial of service of the web management CGI component.

## Affected products

- TOTOLINK EX1200L 9.3.5u.6146_B20201023

## Timeline

- 2026-08-17: disclosed: Advisory published on NVD
- 2026-07-01: other: Exploit proof-of-concept publicly disclosed on GitHub

## References

- [https://gist.github.com/wyxstarry/afdc067090575c216a9d2622c3338e5c](https://gist.github.com/wyxstarry/afdc067090575c216a9d2622c3338e5c)
- [https://vuldb.com/cve/CVE-2026-75012](https://vuldb.com/cve/CVE-2026-75012)

## Related threats

- [TOTOLINK EX1200L null pointer dereference in setWizardCfg](https://junglewise.ai/threats/cve-2026-75013-totolink-ex1200l-null-pointer-dereference-in-setwizardcfg)
- [Totolink EX1200L buffer overflow in cstecgi.cgi login](https://junglewise.ai/threats/cve-2026-44089-totolink-ex1200l-buffer-overflow-in-cstecgi-cgi-login)