CVE-2025-28026: a830r Stack Overflow — Exploit

Description

TOTOLINK A830R V4.1.2cu.5182_B20201102, A950RG V4.1.2cu.5161_B20200903, A3000RU V5.9c.5185_B20201128, and A3100R V4.1.2cu.5247_B20211129 were found to contain a buffer overflow vulnerability in downloadFile.cgi.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-121 CWE-121

Affected Products

Vendor	Product	Versions
totolink	a830r_firmware	All
totolink	a830r	All
totolink	a950rg_firmware	All
totolink	a950rg	All
totolink	a3000ru_firmware	All
totolink	a3000ru	All
totolink	a3100r_firmware	All
totolink	a3100r	All

References

Exploits

https://locrian-lightning-dc7.notion.site/BufferOverflow3-19e8e5e2b1a28048b8ddd4afdbe18d55 https://locrian-lightning-dc7.notion.site/CVE-2025-28026-BufferOverflow3-19e8e5e2b1a28048b8ddd4afdbe18d55

Frequently Asked Questions

What is CVE-2025-28026? +

TOTOLINK A830R V4.1.2cu.5182_B20201102, A950RG V4.1.2cu.5161_B20200903, A3000RU V5.9c.5185_B20201128, and A3100R V4.1.2cu.5247_B20211129 were found to contain a buffer overflow vulnerability in downloadFile.cgi. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2025-28026? +

CVE-2025-28026 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-28026? +

CVE-2025-28026 affects products from totolink, specifically: a3000ru, a3000ru_firmware, a3100r, a3100r_firmware, a830r, a830r_firmware, a950rg, a950rg_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-28026? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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