CVE-2021-30186: codesys plcwinnt Out-of-bounds Write
CVSS: 7.5v3.1HighAnalyzed
Published 25-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-30186 is a high (CVSS 7.5) Out-of-bounds Write vulnerability in codesys plcwinnt. EPSS estimates a 7.74% chance of exploitation in the next 30 days, higher than 94.5% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
7.74%
0%100%
Low · +0.38 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 25-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
CODESYS V2 runtime system SP before 2.4.7.55 has a Heap-based Buffer Overflow.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesSingle source
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
7.74%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
+0.38 pp
From 7.36% on 19-09-2026
19-09-202619-10-2026
EPSS score7.74%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Wago27 products
- 750-8202_firmware< 03.06.19_\(18\)
- 750-8203_firmware< 03.06.19_\(18\)
- 750-8204_firmware< 03.06.19_\(18\)
- 750-8206_firmware< 03.06.19_\(18\)
- 750-8207_firmware< 03.06.19_\(18\)
Codesys2 products
- plcwinnt< 2.4.7.55
- runtime_toolkit< 2.4.7.55
2 vendors · 29 products