MZ Automation lib60870 up to 2.4.0 IEC 60870-5-104 Protocol InformationObject_ParseObjectAddress heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k2.12

Summaryinfo

A vulnerability has been found in MZ Automation lib60870 up to 2.4.0 and classified as critical. This affects the function InformationObject_ParseObjectAddress of the component IEC 60870-5-104 Protocol Handler. Performing a manipulation results in heap-based overflow. This vulnerability is known as CVE-2026-63033. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in MZ Automation lib60870 up to 2.4.0. This affects the function InformationObject_ParseObjectAddress of the component IEC 60870-5-104 Protocol Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-63033 since 07/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.4.1 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
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: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: lib60870 2.4.1

Timelineinfo

07/17/2026 CVE reserved
07/30/2026 +13 days VulDB entry created
07/31/2026 +0 days Advisory disclosed
07/31/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-63033 (🔒)
GCVE (CVE): GCVE-0-2026-63033
GCVE (VulDB): GCVE-100-384975

Entryinfo

Created: 07/31/2026 01:29
Changes: 07/31/2026 01:29 (57)
Complete: 🔍
Cache ID: 216::103

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