VDB
CVE-2021-34596
CVE-2021-34596
PUBLISHED
CVSS 6.5 MEDIUM
CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service
Reported by certvde · Published October 26, 2021
A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| 750-8204_firmware | wago | fw20 |
| 750-829_firmware | wago | fw17 |
| 750-8214_firmware | wago | fw20 |
| 750-831_firmware | wago | fw17 |
| 750-8207_firmware | wago | fw20 |
| 750-8208_firmware | wago | fw20 |
| 750-8202_firmware | wago | fw20 |
| 750-862_firmware | wago | fw10 |
| 750-8210_firmware | wago | fw20 |
| 750-881_firmware | wago | fw17 |
| 750-882_firmware | wago | fw17 |
| 750-8217_firmware | wago | fw20 |
19 more packages have a fixed version. See every fix in Lookup.
Risk scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
| Vendor | Product | Versions |
|---|---|---|
| CODESYS | CODESYS V2 | Runtime Toolkit 32 bit full, PLCWinNT |
| CODESYS | CODESYS V2 | * |
Timeline
- Oct 26, 2021 CVE Published
- Oct 27, 2021 EPSS Score (30 in total, the first dated here)
- Sep 16, 2024 CVE Updated
- Jun 1, 2026 Security Advisory
- Jul 29, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2021-34596
vulnetix vdb fixes CVE-2021-34596Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2021-34596/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart