What is the CVSS score of CVE-2021-36763?

CVE-2021-36763 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 1.0%.

Codesys CVE-2021-36763

HIGH

Files or Directories Accessible to External Parties (CWE-552)

2021-08-03 cve@mitre.org

Information Disclosure Path Traversal Codesys Control Win Sl Control Control Runtime System Toolkit Control Rte Embedded Target Visu Toolkit Hmi Remote Target Visu Toolkit

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-552 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling File access restriction MITRE ATT&CK 2 techniques across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 1.0% exploitation probability (EPSS)

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AnalysisAI

In CODESYS V3 web server before 3.5.17.10, files or directories are accessible to External Parties. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-552. In CODESYS V3 web server before 3.5.17.10, files or directories are accessible to External Parties. Affected products include: Codesys Control, Codesys Control Rte, Codesys Control Runtime System Toolkit, Codesys Control Win Sl, Codesys Embedded Target Visu Toolkit. Version information: before 3.5.17.10.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionNVD

In CODESYS V3 web server before 3.5.17.10, files or directories are accessible to External Parties.

Threat Intelligence Overview

EPSS Score

1.0%

Top 41% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 1.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:codesys:control:*:*:*:*:*:beaglebone_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:empc-a\/imx6_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:iot2000_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:linux_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:pfc100_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:pfc200_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:plcnext_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:raspberry_pi_sl:*:*

cpe:2.3:a:codesys:control:*:*:*:*:*:wago_touch_panels_600_sl:*:*

cpe:2.3:a:codesys:control_rte:*:*:*:*:*:-:*:*

cpe:2.3:a:codesys:control_rte:*:*:*:*:*:beckhoff_cx:*:*

cpe:2.3:a:codesys:control_runtime_system_toolkit:*:*:*:*:*:*:*:*

cpe:2.3:a:codesys:control_win_sl:*:*:*:*:*:*:*:*

cpe:2.3:a:codesys:embedded_target_visu_toolkit:*:*:*:*:*:*:*:*

cpe:2.3:a:codesys:hmi:*:*:*:*:*:*:*:*

cpe:2.3:a:codesys:remote_target_visu_toolkit:*:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16803&token=0b8edf9276dc39ee52f43026c415c5b38085d90a&download=

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

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