CVE-2025-57623 Details
Description
A NULL pointer dereference in TOTOLINK N600R firmware v4.3.0cu.7866_B2022506 allows attackers to cause a Denial of Service.
A NULL pointer dereference vulnerability has been identified in TOTOLINK N600R firmware version 4.3.0cu.7866_B2022506. This vulnerability allows attackers to cause a denial-of-service condition by exploiting the cstecgi.cgi binary. The issue arises when the program's main function attempts to read the CONTENT_LENGTH environment variable. If the variable is not set, a null pointer is returned, which is then improperly handled by being passed to the strtol function. This mismanagement leads to the null pointer being dereferenced, causing a crash and denial-of-service.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 26, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gist.github.com/z472421519/d17061ea79a72d39fe69c000fa1a6280 | [email protected] | ExploitThird Party Advisory |
| https://github.com/z472421519/BinaryAudit/blob/main/PoC/NPD/TOTOLink/CONTENT_LENGTH.md | [email protected] | Exploit |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| totolink n600r firmware | 4.3.0cu.7866_b2022506 |
CPE
Remediation
| |
| totolink n600r | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Sep 29, 2025 | Initial Analysis | [email protected] |
| Sep 26, 2025 | CVE Modified | CISA-ADP |
| Sep 25, 2025 | New CVE Received | [email protected] |