6.5

CVE-2021-34596: codesys Access of Uninitialized Pointer

CVSS: 6.5v3.1MediumAnalyzed
Published 26-10-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-34596 is a medium (CVSS 6.5) Access of Uninitialized Pointer vulnerability in codesys. EPSS estimates a 0.83% chance of exploitation in the next 30 days, higher than 56.8% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.83%
0%100%
Low · -0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-10-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.83%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

-0.02 pp

From 0.85% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.83%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Wago27 products
Codesys4 products

2 vendors · 31 products

References

1 links