CVE-2023-34285

Root code execution via unchecked cmsCli_authenticate stack copy

Published May 3, 2024 · Updated Aug 2, 2024

Stack-based buffer overflow in NETGEAR RAX30 firmware 1.0.9.92_1 allows network-adjacent attackers to execute arbitrary code as root. The cmsCli_authenticate routine does not validate user-supplied data length before copying it into a fixed-length stack buffer in a shared library used by telnetd. The service listens on TCP port 23 by default; ZDI reports no authentication is required, while NETGEAR says exploitation requires local-network access and router administrator credentials.

CVSS severity8.8
High
EPSS probability0.90%
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 NETGEAR RAX30 firmware 1.0.9.92_1 allows network-adjacent attackers to execute arbitrary code as root. The cmsCli_authenticate routine does not validate user-supplied data length before copying it into a fixed-length stack buffer in a shared library used by telnetd. The service listens on TCP port 23 by default; ZDI reports no authentication is required, while NETGEAR says exploitation requires local-network access and router administrator credentials.

The record

CVE
CVE-2023-34285
Published
May 3, 2024
Updated
Aug 2, 2024
Vendor
NETGEAR
Product
RAX30
Classifications
CWE-787, CWE-121, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=-
  2. Affected versionversion=1.0.9.92_1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

NETGEAR · RAX30version=-; version=1.0.9.92_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
8.8NISTCVSS:3.1/AV:A/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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