CVE-2025-34450Public exploit

Application crash via unbounded RF pulse parsing

Published Dec 18, 2025 · Updated Dec 18, 2025

Stack-based buffer overflow in merbanan rtl_433 25.02 and earlier allows attackers to crash the application via oversized raw RF data. parse_rfraw() adds pulse entries without first enforcing the PD_MAX_PULSES capacity, and repeated packets expand into the fixed pulse_data stack array. The demonstrated path uses locally supplied test input, while the advisory also identifies device-supplied RF input; code execution remains unproven.

CVSS severity6.9
Medium
EPSS probability0.23%
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 merbanan rtl_433 25.02 and earlier allows attackers to crash the application via oversized raw RF data. parse_rfraw() adds pulse entries without first enforcing the PD_MAX_PULSES capacity, and repeated packets expand into the fixed pulse_data stack array. The demonstrated path uses locally supplied test input, while the advisory also identifies device-supplied RF input; code execution remains unproven.

The record

CVE
CVE-2025-34450
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
merbanan
Product
rtl_433
Classifications
CWE-787, CWE-121, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 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=0 <=25.02

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

merbanan · rtl_433version=0 <=25.02

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.9VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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