What is CVE-2020-15634?

CVE-2020-15634 is a medium-severity vulnerability in NETGEAR R6700, classified under Use of Externally-Controlled Format String. CVSS score: 6.3/10. Published 2020-08-20.

How severe is CVE-2020-15634?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in NETGEAR R6700

CVE-2020-15634

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700 routers with firmware 1.0.4.84_10.0.58. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of string table file uploads. The issue results from the lack of proper validation of a user-supplied string before using it as a format specifier. An attacker can leverage this vulnerability to execute code in the context of the web server. Was ZDI-CAN-9755.

Published 2020-08-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.014 (71.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.2% 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 R6700 — versions v3, 1.0.4.84_10.0.58
NETGEAR R6700 Firmware

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

www.zerodayinitiative.com/advisories/ZDI-20-935/ (VDB Entry, Third Party Advisory)
kb.netgear.com/000062126/Security-Advisory-for-Pre-Authentication-Command-Injec… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-15634?: CVE-2020-15634 is a medium-severity vulnerability in NETGEAR R6700, classified under Use of Externally-Controlled Format String. CVSS score: 6.3/10. Published 2020-08-20.
How severe is CVE-2020-15634?: Medium severity. CVSS v3 base score is 6.3 out of 10.