VDB-102944 · CVE-2017-6030 · BID 97254

Schneider Electric Modicon M221/Modicon M241/Modicon M251 TCP Initial Sequence Number entropy

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 (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Schneider Electric Modicon M221, Modicon M241 and Modicon M251. The affected element is an unknown function of the component TCP Initial Sequence Number Handler. Such manipulation leads to entropy. This vulnerability is traded as CVE-2017-6030. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Schneider Electric Modicon M221, Modicon M241 and Modicon M251 (SCADA Software) (affected version not known). Affected by this issue is some unknown functionality of the component TCP Initial Sequence Number Handler. The manipulation with an unknown input leads to a entropy vulnerability. Using CWE to declare the problem leads to CWE-331. The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A Predictable Value Range from Previous Values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The affected products generate insufficiently random TCP initial sequence numbers that may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections.

The bug was discovered 03/30/2017. The weakness was shared 06/30/2017 (Website). The advisory is shared for download at ics-cert.us-cert.gov. This vulnerability is handled as CVE-2017-6030 since 02/16/2017. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

The vulnerability was handled as a non-public zero-day exploit for at least 91 days. During that time the estimated underground price was around $0-$5k.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 97254†). The entries VDB-102942 and VDB-102943 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

SCADA Software

Vendor

Schneider Electric

Name

License

commercial

Website

Vendor: https://www.schneider-electric.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

ADP CISA Base Score: 6.5
ADP CISA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Entropy
CWE: CWE-331 / CWE-330 / CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/16/2017 🔍
03/30/2017 +42 days 🔍
03/30/2017 +0 days 🔍
06/29/2017 +91 days 🔍
06/30/2017 +1 days 🔍
06/30/2017 +0 days 🔍
05/29/2026 +3255 days 🔍

Sourcesinfo

Vendor: schneider-electric.com

Advisory: ics-cert.us-cert.gov
Researcher: David Formby, Raheem Beyah
Status: Confirmed

CVE: CVE-2017-6030 (🔍)
GCVE (CVE): GCVE-0-2017-6030
GCVE (VulDB): GCVE-100-102944
SecurityFocus: 97254 - Multiple Schneider Electric Modicon Products Weak Cryptography Multiple Security Weaknesses

See also: 🔍

Entryinfo

Created: 06/30/2017 10:49
Updated: 05/29/2026 21:38
Changes: 06/30/2017 10:49 (61), 10/21/2019 12:52 (3), 12/30/2020 10:21 (2), 05/29/2026 21:38 (34)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.