Buffer overflow in Totolink A950rg
CVE-2026-121597
A weakness has been identified in TOTOLINK A950RG 4.1.2cu.5268_B20221104. This affects the function setAppEasyWizardConfig of the file /cgi-bin/cstecgi.cgi of the component Easy Setup Wizard Handler. Executing a manipulation of the argument functionType can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Totolink A950rg — versions 4.1.2cu.5268_B20221104
Weakness classification (CWE)
References
- gist.github.com/H3rmesk1t/49d6ccded59379651568e0bdc6b5624c (exploit)
- vuldb.com/cve/CVE-2026-121597 (third-party-advisory)
- vuldb.com/submit/1022558 (third-party-advisory)
- vuldb.com/vuln/430439 (technical-description, vdb-entry)
- vuldb.com/vuln/430439/cti (signature, permissions-required)
- www.totolink.net/ (product, broken-link)
Frequently asked questions
- What is CVE-2026-121597?
- CVE-2026-121597 is a critical-severity vulnerability in Totolink A950rg, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.9/10. Published 2026-11-04.
- How severe is CVE-2026-121597?
- Critical severity. CVSS v3 base score is 9.9 out of 10.