Shelly Pro 3EM Modbus out-of-bounds

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Shelly Pro 3EM. The affected element is an unknown function of the component Modbus Handler. The manipulation leads to out-of-bounds. This vulnerability is documented as CVE-2025-12056. The attack requires being on the local network. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Shelly Pro 3EM (affected version unknown). This issue affects an unknown functionality of the component Modbus Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. The summary by CVE is:

Out-of-bounds Read in Shelly Pro 3EM (before v1.4.4) allows Overread Buffers.

The advisory is shared at cisa.gov. The identification of this vulnerability is CVE-2025-12056. The exploitation is known to be easy. The attack can only be done within the local network. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-198138). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.5
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/19/2025 Advisory disclosed
11/19/2025 +0 days VulDB entry created
11/19/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: icsa-25-322-03
Status: Not defined

CVE: CVE-2025-12056 (🔒)
GCVE (CVE): GCVE-0-2025-12056
GCVE (VulDB): GCVE-100-332921
EUVD: 🔒

Entryinfo

Created: 11/19/2025 07:37
Updated: 11/19/2025 09:32
Changes: 11/19/2025 07:37 (50), 11/19/2025 08:25 (13), 11/19/2025 09:32 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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