What is CVE-2021-34980?

CVE-2021-34980 is a high-severity vulnerability in NETGEAR R6260, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2022-01-13.

How severe is CVE-2021-34980?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in NETGEAR R6260

CVE-2021-34980

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6260 1.1.0.78_1.0.1 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the setupwizard.cgi page. When parsing the SOAP_LOGIN_TOKEN environment variable, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-14107.

Vulnerability class: Buffer Overflow

Published 2022-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

NETGEAR R6260 — versions 1.1.0.78_1.0.1
NETGEAR R6260 Firmware — versions 1.1.0.78_1.0.1

Weakness classification (CWE)

References

www.zerodayinitiative.com/advisories/ZDI-21-1242/ (VDB Entry, Third Party Advisory)
kb.netgear.com/000064262/Security-Advisory-for-Vertical-Privilege-Escalation-on… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-34980?: CVE-2021-34980 is a high-severity vulnerability in NETGEAR R6260, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2022-01-13.
How severe is CVE-2021-34980?: High severity. CVSS v3 base score is 8.8 out of 10.