CVE-2021-36763
CVE-2021-36763 is a high-severity vulnerability in Codesys Control with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-552.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (59th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-552
- Affected product: Codesys Control
- Published:
- Last modified:
Description
In CODESYS V3 web server before 3.5.17.10, files or directories are accessible to External Parties.
Frequently asked questions
- What is CVE-2021-36763?
- In CODESYS V3 web server before 3.5.17.10, files or directories are accessible to External Parties.
- How severe is CVE-2021-36763?
- CVE-2021-36763 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2021-36763 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-36763?
- CVE-2021-36763 primarily affects Codesys Control. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-36763?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-36763 published?
- CVE-2021-36763 was published on 2021-08-03 and last updated on 2026-06-17.
References
Affected products (16)
- 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:*:*:*:*:*:*:*:*
More vulnerabilities in Codesys Control
- CVE-2021-33485 — Critical (CVSS 9.8): CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.
All CVEs affecting Codesys Control →
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