CVE-2023-34435Network attack vector

Authenticated arbitrary firmware installation via unchecked upload

Published Jul 8, 2024 · Updated Nov 4, 2025

Improper firmware verification in Realtek rtl819x Jungle SDK 3.4.11 allows remote authenticated users to install arbitrary firmware. The boa /boafrm/formUpload handler accepts an uploaded image and completes the router upgrade without checking the firmware's validity or signature. Administrative access to the web interface is required, and a successful upload replaces trusted device code with attacker-controlled firmware.

CVSS severity7.2
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper firmware verification in Realtek rtl819x Jungle SDK 3.4.11 allows remote authenticated users to install arbitrary firmware. The boa /boafrm/formUpload handler accepts an uploaded image and completes the router upgrade without checking the firmware's validity or signature. Administrative access to the web interface is required, and a successful upload replaces trusted device code with attacker-controlled firmware.

The record

CVE
CVE-2023-34435
Published
Jul 8, 2024
Updated
Nov 4, 2025
Vendor
Realtek Semiconductor Corp.
Product
Realtek AP-Router SDK
Classifications
CWE-347, T1601.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=v3.4.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Realtek Semiconductor Corp. · Realtek AP-Router SDKversion=v3.4.11
LevelOne · WBR-6013version=rer4_a_v3411b_2t2r_lev_09_170623; version=RER4_A_v3411b_2T2R_LEV_09_170623
Realtek Semiconductor Corp. · RTL819x Software Development Kitversion=3.4.11

Published CVSS scores

7.2Cisco TalosCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1601.001System Firmware

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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