CVE-2021-34978Public exploit

Root code execution via unterminated SOAP fields

Published Jan 13, 2022 · Updated Aug 4, 2024

Stack-based buffer overflow in setupwizard.cgi in NETGEAR R6260 1.1.0.78_1.0.1 allows remote attackers to execute code via SOAP. The analyse_XML_namespace function copies attacker-controlled XML namespace fields with strncpy without guaranteeing termination, then concatenates overlapping strings with sprintf into a fixed stack buffer. Access from the router's LAN is required; authentication and user interaction are not, and successful exploitation executes code as root.

CVSS severity8.8
High
EPSS probability1.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in setupwizard.cgi in NETGEAR R6260 1.1.0.78_1.0.1 allows remote attackers to execute code via SOAP. The analyse_XML_namespace function copies attacker-controlled XML namespace fields with strncpy without guaranteeing termination, then concatenates overlapping strings with sprintf into a fixed stack buffer. Access from the router's LAN is required; authentication and user interaction are not, and successful exploitation executes code as root.

The record

CVE
CVE-2021-34978
Published
Jan 13, 2022
Updated
Aug 4, 2024
Vendor
NETGEAR
Product
AC1600 Smart WiFi Router Dual Band Gigabit (R6260)
Classifications
CWE-121, CWE-787, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.1.0.78_1.0.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

NETGEAR · AC1600 Smart WiFi Router Dual Band Gigabit (R6260)version=1.1.0.78_1.0.1

Published CVSS scores

8.8Zero Day InitiativeCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NETGEARCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3NIST National Vulnerability DatabaseAV:A/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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