WAGO 750-81xx Packet buffer overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.3$0-$5k0.00

A vulnerability was found in WAGO 750-81xx, 750-82xx, 752-8303, 762-4xxx, 762-5xxx and 762-6xxx and classified as very critical. This issue affects an unknown functionality of the component Packet Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.

The weakness was published 11/09/2022 as VDE-2020-036. The advisory is shared at cert.vde.com. The identification of this vulnerability is CVE-2021-34566 since 06/10/2021. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/09/2022).

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

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.5
VulDB Meta Temp Score: 9.3

VulDB Base Score: 9.8
VulDB Temp Score: 9.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 9.1
CNA Vector (CERT VDE): 🔍

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

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

06/10/2021 🔍
11/09/2022 +517 days 🔍
11/09/2022 +0 days 🔍
11/09/2022 +0 days 🔍

Sourcesinfo

Advisory: VDE-2020-036
Status: Not defined

CVE: CVE-2021-34566 (🔍)

Entryinfo

Created: 11/09/2022 20:34
Changes: 11/09/2022 20:34 (48)
Complete: 🔍

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