CVE-2023-36187Network attack vector

Unauthenticated code execution via crafted httpd URL

Published Sep 1, 2023 · Updated Oct 1, 2024

Buffer overflow in NETGEAR R6400v2 before 1.0.4.118 allows remote attackers to execute arbitrary code through a crafted URL sent to httpd. NETGEAR has not disclosed which httpd URL handler copies the request into a fixed-size buffer or the unchecked operation that causes the overflow. The request requires no authentication; the CVE record reports code execution, while NETGEAR's advisory describes adjacent-network availability impact only.

CVSS severity9.8
Critical
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in NETGEAR R6400v2 before 1.0.4.118 allows remote attackers to execute arbitrary code through a crafted URL sent to httpd. NETGEAR has not disclosed which httpd URL handler copies the request into a fixed-size buffer or the unchecked operation that causes the overflow. The request requires no authentication; the CVE record reports code execution, while NETGEAR's advisory describes adjacent-network availability impact only.

The record

CVE
CVE-2023-36187
Published
Sep 1, 2023
Updated
Oct 1, 2024
Vendor
NETGEAR
Product
R6400v2
Classifications
CWE-120, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=0 <1.0.4.118

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NETGEAR · R6400v2version=0 <1.0.4.118

Published CVSS scores

6.5NETGEARCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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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