CVE-2021-30191: codesys v2_web_server Classic Buffer Overflow
CVSS: 7.5v3.1HighAnalyzed
Published 25-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-30191 is a high (CVSS 7.5) Classic Buffer Overflow vulnerability in codesys v2_web_server. EPSS estimates a 0.99% chance of exploitation in the next 30 days, higher than 61.9% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.99%
0%100%
Low · -0.03 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 Web-Server before 1.1.9.20 has a a Buffer Copy without Checking the Size of the Input.
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
0.99%
Chance of exploitation in the next 30 days
Percentile
62%
Versus all other CVEs
30-day change
-0.03 pp
From 1.02% on 20-09-2026
20-09-202620-10-2026
EPSS score0.99%
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_\(18\)
Codesys1 product
- v2_web_server< 1.1.9.20
2 vendors · 28 products