Deserialization in Codesys
CVE-2021-21867
An unsafe deserialization vulnerability exists in the ObjectManager.plugin ObjectStream.ProfileByteArray functionality of CODESYS GmbH CODESYS Development System 3.5.16 and 3.5.17. A specially crafted file can lead to arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.016 (75.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
- Codesys — versions 3.5.16.0, 3.5.17.0
- Codesys — versions CODESYS GmbH CODESYS Development System 3.5.16, CODESYS GmbH CODESYS Development System 3.5.17
Weakness classification (CWE)
References
- talosintelligence.com/vulnerability_reports/TALOS-2021-1304 (Exploit, Third Party Advisory)
- customers.codesys.com/index.php (Patch, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-21867?
- CVE-2021-21867 is a high-severity vulnerability in Codesys, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2021-08-18.
- How severe is CVE-2021-21867?
- High severity. CVSS v3 base score is 7.8 out of 10.