CVE-2021-34586: codesys NULL Pointer Dereference
CVSS: 7.5v3.1HighAnalyzed
Published 26-10-2021Last modified 17-09-2024
Vulnerability summary
CVE-2021-34586 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in codesys. EPSS estimates a 13.74% chance of exploitation in the next 30 days, higher than 96.4% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
13.74%
0%100%
Medium · +0.66 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 26-10-2021PublishedVulnerability first disclosed.
- 17-09-2024Last modifiedVulnerability information updated.
Description
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
13.74%
Chance of exploitation in the next 30 days
Percentile
96%
Versus all other CVEs
30-day change
+0.66 pp
From 13.08% on 20-09-2026
20-09-202620-10-2026
EPSS score13.74%
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