CVE-2021-30191 json
CODESYS V2 Web-Server before 1.1.9.20 has a a Buffer Copy without Checking the Size of the Input.
published 2021-05-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17123
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
CODESYS V2 Web-Server before 1.1.9.20 has a a Buffer Copy without Checking the Size of the Input.
Patch / fix
- codesys v2_web_server 1.1.9.20
- wago 750-893_firmware fw08
- wago 750-891_firmware fw08
- wago 750-890_firmware fw08
- wago 750-889_firmware fw15
- wago 750-885_firmware fw15
- wago 750-882_firmware fw15
- wago 750-881_firmware fw15
- wago 750-880_firmware fw16
- wago 750-862_firmware fw08
- wago 750-852_firmware fw15
- wago 750-832_firmware fw08
- wago 750-831_firmware fw15
- wago 750-829_firmware fw15
- wago 750-8202_firmware 03.06.19_\(18\)
- wago 750-8203_firmware 03.06.19_\(18\)
- wago 750-8204_firmware 03.06.19_\(18\)
- wago 750-8206_firmware 03.06.19_\(18\)
- wago 750-8207_firmware 03.06.19_\(18\)
- wago 750-8208_firmware 03.06.19_\(18\)
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-21-173-02 updated cvss 7.5
CODESYS V2 web server
-
CODESYS, GmbH CODESYS reports all CODESYS V2 web servers running stand-alone or as part of the CODESYS runtime system < 1.1.9.20affected: mitigation “Please visit the CODESYS update area for more information on how to obtain the software updates.” codesys.com
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
Exploit prediction
0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-120 Buffer Copy without Checking Size of Input
References
-
customers.codesys.com
/index.php
permissions-required, vendor-advisory
-
customers.codesys.com
/index.php?eID=dumpFile&t=f&f=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&download=
vendor-advisory
Sources
- CVE List CVE-2021-30191
- NVD CVE-2021-30191
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.