CVE-2021-34593

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

2.66% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 85.4% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-26 09:55Z5 YR AGO

Last updated

2024-09-17 04:10Z2 YR AGO

Reserved

2021-06-10

Assigning CNA

CERTVDE

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.1

Document digest

b958b56dd2d33a5f27afed565ba7d23e83a97e921f3d47217e429914f9bdffee

• customers.codesys.comhttps://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download=x_refsource_CONFIRM
• seclists.org20211029 SEC Consult SA-20211028-0 :: Denial of Service in CODESYS V2http://seclists.org/fulldisclosure/2021/Oct/64mailing-listx_refsource_FULLDISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.htmlx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.htmlx_refsource_MISC