CVE-2021-34584: codesys Buffer Over-read
CVSS: 9.1v3.1CriticalAnalyzed
Published 26-10-2021Last modified 16-09-2024
Vulnerability summary
CVE-2021-34584 is a critical (CVSS 9.1) Buffer Over-read vulnerability in codesys. EPSS estimates a 1.08% chance of exploitation in the next 30 days, higher than 64.6% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)EPSS score
1.08%
0%100%
Low · -0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 26-10-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
Crafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HSourcesAll 2 agree
- NVDNIST9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Medium 6.4Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:N/A:PSourcesSingle source
EPSS trend
Probability
1.08%
Chance of exploitation in the next 30 days
Percentile
65%
Versus all other CVEs
30-day change
-0.03 pp
From 1.11% on 20-09-2026
20-09-202620-10-2026
EPSS score1.08%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (tenable.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Wago27 products
- 750-8202_firmware< fw20
- 750-8203_firmware< fw20
- 750-8204_firmware< fw20
- 750-8206_firmware< fw20
- 750-8207_firmware< fw20
Codesys2 products
- codesys< 1.1.9.22
- codesys v2≥ all web servers, < V1.1.9.22
2 vendors · 29 products