CVE-2020-7549 Vulnerability Analysis & Exploit Details

CVE-2020-7549
Vulnerability Scoring

5.3
/10
Significant Risk

Security assessments indicate that CVE-2020-7549 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2020-7549 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:37 UTC
Originally published on: 🕐 11 Dec 2020, 01:15 UTC

Time between publication and last update: 1441 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVE-2020-7549 Vulnerability Summary

CVE-2020-7549: A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions), that could cause denial of HTTP and FTP services when a series of specially crafted requests is sent to the controller over HTTP.

Assessing the Risk of CVE-2020-7549

Access Complexity Graph

The exploitability of CVE-2020-7549 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2020-7549

With low attack complexity and no required privileges, CVE-2020-7549 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2020-7549, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2020-7549, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2020-7549 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2020-7549 poses no threat to data integrity.
  • Availability: Low
    CVE-2020-7549 may slightly degrade system performance without fully affecting service availability.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.092% (probability of exploit)

EPSS Percentile: 41.56% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 58.44% of others.

CVE-2020-7549 References

External References

CWE Common Weakness Enumeration

CWE-754

Vulnerable Configurations

  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:3.20:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp341000_firmware:3.20:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp341000:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp341000:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:3.20:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp342000_firmware:3.20:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp342000:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp342000:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:3.20:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102_firmware:3.20:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420102:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420102:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102cl_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102cl_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102cl_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420102cl_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420102cl:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420102cl:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp342020_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp342020_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp342020_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp342020_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp342020:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp342020:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302_firmware:3.20:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302_firmware:3.20:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420302:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420302:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302cl_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:modicon_m340_bmxp3420302cl_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420302cl:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:modicon_m340_bmxp3420302cl:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.2:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.2:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.3:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.3:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.5:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.5:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.6:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.6:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.7:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.7:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.9:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:2.9:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.00:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.00:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.1:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.1:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.2:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.2:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.3:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0100_firmware:3.3:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:bmxnoe0100:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:bmxnoe0100:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:2.8:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:2.8:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.3:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.3:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.5:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.5:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.6:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.6:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.7:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.7:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.9:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:5.9:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.0:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.0:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.1:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.1:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.2:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.2:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.3:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.3:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.4:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.4:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.5:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoe0110_firmware:6.5:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:bmxnoe0110:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:bmxnoe0110:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:bmxnoc0401_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:bmxnoc0401_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:bmxnoc0401:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:bmxnoc0401:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:140noe77111_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:140noe77111_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:140noe77111_firmware:7.0:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:140noe77111_firmware:7.0:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:140noe77111_firmware:7.1:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:140noe77111_firmware:7.1:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:140noe77111:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:140noe77111:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:140noc78100_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:140noc78100_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:140noc78100:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:140noc78100:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:140noc78000_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:140noc78000_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:140noc78000:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:140noc78000:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:140cpu65150_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:140cpu65150_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:140cpu65150:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:140cpu65150:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:tsxety4103_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:tsxety4103_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:tsxety4103:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:tsxety4103:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:tsxety5103_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:tsxety5103_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:tsxety5103:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:tsxety5103:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:tsxp574634_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:tsxp574634_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:tsxp574634:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:tsxp574634:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:tsxp575634_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:tsxp575634_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:tsxp575634:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:tsxp575634:-:*:*:*:*:*:*:*
  • cpe:2.3:o:schneider-electric:tsxp576634_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:schneider-electric:tsxp576634_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:schneider-electric:tsxp576634:-:*:*:*:*:*:*:*
    cpe:2.3:h:schneider-electric:tsxp576634:-:*:*:*:*:*:*:*

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