CVE-2021-34596 (GCVE-0-2021-34596)
Vulnerability from cvelistv5 – Published: 2021-10-26 09:55 – Updated: 2024-09-16 22:40
VLAI
EPSS
VEX
Title
CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service
Summary
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.
Severity
6.5 (Medium)
CWE
- CWE-824 - Access of Uninitialized Pointer
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://customers.codesys.com/index.php?eID=dumpF… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| CODESYS | CODESYS V2 |
Affected:
Runtime Toolkit 32 bit full , < V2.4.7.56
(custom)
Affected: PLCWinNT , < V2.4.7.56 (custom) |
guessed |
Date Public
2021-10-25 00:00
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T00:19:47.653Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16878\u0026token=e5644ec405590e66aefa62304cb8632df9fc9e9c\u0026download="
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "CODESYS V2",
"vendor": "CODESYS",
"versions": [
{
"lessThan": "V2.4.7.56",
"status": "affected",
"version": "Runtime Toolkit 32 bit full",
"versionType": "custom"
},
{
"lessThan": "V2.4.7.56",
"status": "affected",
"version": "PLCWinNT",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "This issue was reported by Gao Jian of NSFOCUS."
}
],
"datePublic": "2021-10-25T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-824",
"description": "CWE-824 Access of Uninitialized Pointer",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-10-26T09:55:54.000Z",
"orgId": "270ccfa6-a436-4e77-922e-914ec3a9685c",
"shortName": "CERTVDE"
},
"references": [
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16878\u0026token=e5644ec405590e66aefa62304cb8632df9fc9e9c\u0026download="
}
],
"solutions": [
{
"lang": "en",
"value": "CODESYS GmbH has released the following product versions to solve the noted vulnerability issue for the affected CODESYS products:\n * CODESYS Runtime Toolkit 32 bit full version V2.4.7.56\n * CODESYS PLCWinNT version V2.4.7.56. This will also be part of the CODESYS Development System setup version V2.3.9.68."
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service",
"x_generator": {
"engine": "Vulnogram 0.0.9"
},
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "info@cert.vde.com",
"DATE_PUBLIC": "2021-10-25T14:00:00.000Z",
"ID": "CVE-2021-34596",
"STATE": "PUBLIC",
"TITLE": "CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "CODESYS V2",
"version": {
"version_data": [
{
"version_affected": "\u003c",
"version_name": "Runtime Toolkit 32 bit full",
"version_value": "V2.4.7.56"
},
{
"version_affected": "\u003c",
"version_name": "PLCWinNT",
"version_value": "V2.4.7.56"
}
]
}
}
]
},
"vendor_name": "CODESYS"
}
]
}
},
"credit": [
{
"lang": "eng",
"value": "This issue was reported by Gao Jian of NSFOCUS."
}
],
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "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."
}
]
},
"generator": {
"engine": "Vulnogram 0.0.9"
},
"impact": {
"cvss": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "CWE-824 Access of Uninitialized Pointer"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16878\u0026token=e5644ec405590e66aefa62304cb8632df9fc9e9c\u0026download=",
"refsource": "CONFIRM",
"url": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16878\u0026token=e5644ec405590e66aefa62304cb8632df9fc9e9c\u0026download="
}
]
},
"solution": [
{
"lang": "en",
"value": "CODESYS GmbH has released the following product versions to solve the noted vulnerability issue for the affected CODESYS products:\n * CODESYS Runtime Toolkit 32 bit full version V2.4.7.56\n * CODESYS PLCWinNT version V2.4.7.56. This will also be part of the CODESYS Development System setup version V2.3.9.68."
}
],
"source": {
"discovery": "EXTERNAL"
}
}
}
},
"cveMetadata": {
"assignerOrgId": "270ccfa6-a436-4e77-922e-914ec3a9685c",
"assignerShortName": "CERTVDE",
"cveId": "CVE-2021-34596",
"datePublished": "2021-10-26T09:55:54.408Z",
"dateReserved": "2021-06-10T00:00:00.000Z",
"dateUpdated": "2024-09-16T22:40:47.921Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-34596",
"date": "2026-09-18",
"epss": "0.00855",
"percentile": "0.56763"
},
"nvd": {
"cve": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-823_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CB62B4CC-6336-4B55-94D7-2B36CA7026E9",
"versionEndExcluding": "fw10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-823:-:*:*:*:*:*:*:*",
"matchCriteriaId": "CB88572A-CB05-4B52-8BFC-05EFDC819244",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-829_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "14796840-D7CC-4F28-9804-8155B780C5C2",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-829:-:*:*:*:*:*:*:*",
"matchCriteriaId": "F88F6E08-2D1B-4B34-B8DB-40292C0BBEB2",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-831_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2C7DB904-69F4-4588-9572-7E45D0DC0001",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-831:-:*:*:*:*:*:*:*",
"matchCriteriaId": "F0631884-FF6F-4AA9-9D76-CDECB5A738FC",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-832_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8779C92D-599D-4D99-8707-A190A81DD93C",
"versionEndExcluding": "fw10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-832:-:*:*:*:*:*:*:*",
"matchCriteriaId": "13D1FA8D-C8BA-4D1C-8372-DECD40177631",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-852_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8303BFCA-85EA-45E3-BC60-4950EECFA480",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-852:-:*:*:*:*:*:*:*",
"matchCriteriaId": "9D6739E1-EF0B-48EE-90FC-5708756FC362",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-862_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A51ABA8B-6DF5-45DB-89C9-ED116FA9CAD2",
"versionEndExcluding": "fw10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-862:-:*:*:*:*:*:*:*",
"matchCriteriaId": "FA04FBFB-9E1C-4618-9FDC-70675506D8D5",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-880_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D78A1283-111B-462E-A958-DB7212D7B04A",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-880:-:*:*:*:*:*:*:*",
"matchCriteriaId": "CFEAC4D9-15CF-44B8-844D-C012AA4637A2",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-881_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "B8DC4322-1B14-4337-B611-23B9F8938D21",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-881:-:*:*:*:*:*:*:*",
"matchCriteriaId": "6FE51647-62C1-4D3C-91FA-13ACA6CD71D2",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-882_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C167AB43-9D9C-44F4-A3C3-892562830DB7",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-882:-:*:*:*:*:*:*:*",
"matchCriteriaId": "B1379D65-F376-4618-B708-5E59D64C8033",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-885_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "48B9BDDC-063F-493D-AC1E-180F04086699",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-885:-:*:*:*:*:*:*:*",
"matchCriteriaId": "7712F56E-AEBA-4DE0-9172-26F3D29B369B",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-889_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C91305B6-0AD5-447C-9E8B-905D9065F938",
"versionEndExcluding": "fw17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-889:-:*:*:*:*:*:*:*",
"matchCriteriaId": "57919AAB-2962-4543-810A-C143300351F8",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-890_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "9F3F2723-F1D6-4565-BEB6-D3A4ABF8CD5D",
"versionEndExcluding": "fw10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-890:-:*:*:*:*:*:*:*",
"matchCriteriaId": "11751A8B-FCFD-433B-9065-B4FC85168A93",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-891_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "78B2640E-D3E0-46EB-B832-B026249DCCD1",
"versionEndExcluding": "fw10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-891:-:*:*:*:*:*:*:*",
"matchCriteriaId": "22BAABD9-A10D-4904-AA02-C37C4490B47A",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-893_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "F3207286-CD18-45BB-9578-3C004D48CC72",
"versionEndExcluding": "fw10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-893:-:*:*:*:*:*:*:*",
"matchCriteriaId": "4D4795D0-B90B-4643-8713-88D89172D1A5",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8202_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1EC04ED1-1CB4-480F-AA0E-648B3CDDE748",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8202:-:*:*:*:*:*:*:*",
"matchCriteriaId": "23B02096-81A5-4823-94F3-D87F389397DE",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8203_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "FD2A9AC3-C6BC-4717-9965-6BD8DA0850BB",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8203:-:*:*:*:*:*:*:*",
"matchCriteriaId": "EC428EC8-532A-4825-BCE3-C42A4BC01C68",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8204_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3320B6C9-B791-48BC-8AD7-4557FE161193",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8204:-:*:*:*:*:*:*:*",
"matchCriteriaId": "7AF14BE1-1EB5-423B-9FE7-E401AEF92553",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8206_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "56E7D2FB-09FF-49AF-A82F-C48A9EDFCAFB",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8206:-:*:*:*:*:*:*:*",
"matchCriteriaId": "2E17ECC4-D7AE-485C-A2EF-4148817F9DB8",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8207_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "2859D0D6-5FF0-497C-ABA5-3DC03F4CB526",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8207:-:*:*:*:*:*:*:*",
"matchCriteriaId": "DA98A0D9-B050-430B-96C5-15932438FD3A",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8208_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4EE3EC4B-99B4-42A0-BBED-C30BF271D7CD",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8208:-:*:*:*:*:*:*:*",
"matchCriteriaId": "C86098FC-E63E-4676-8BA1-ADCA30795558",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8210_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "AA3273B8-13BD-4FCD-826D-D41AFA443E56",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8210:-:*:*:*:*:*:*:*",
"matchCriteriaId": "1E11758B-46C3-4E57-943A-C9C073AE5211",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8211_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BB755670-0195-4819-9D43-70FE1F365E32",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8211:-:*:*:*:*:*:*:*",
"matchCriteriaId": "5CD6B267-3E4B-4597-82A6-130D6F21C728",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8212_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A88C970A-99B7-4E9B-87C4-5FC04D798931",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8212:-:*:*:*:*:*:*:*",
"matchCriteriaId": "20BBC380-0F6E-4400-93AF-5B6CFEF00562",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8213_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "95C3EC2D-0E70-4DA1-9203-75B7069A616E",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8213:-:*:*:*:*:*:*:*",
"matchCriteriaId": "4969E8EB-EF09-47B9-8F03-37BB87CFD048",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8214_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3C15ACE6-923E-4663-8EBC-06A3AB0063D7",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8214:-:*:*:*:*:*:*:*",
"matchCriteriaId": "979A8E43-4285-4A7B-BB0B-E6888117862C",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8216_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8BCF2ADD-529D-43C7-9BB8-E384BBB4C6B4",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8216:-:*:*:*:*:*:*:*",
"matchCriteriaId": "3B854F74-173E-4523-BBA7-8FF7A9B9880E",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:wago:750-8217_firmware:*:*:*:*:*:*:*:*",
"matchCriteriaId": "C00EB9A1-8709-40D9-8028-615980927BFA",
"versionEndExcluding": "fw20",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:h:wago:750-8217:-:*:*:*:*:*:*:*",
"matchCriteriaId": "B23CD8FD-FC7A-4E24-BF8F-648478D82645",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:codesys:codesys:*:*:*:*:*:*:*:*",
"matchCriteriaId": "00DD970C-3E55-4EDC-A335-3C71C19B0E99",
"versionEndExcluding": "1.1.9.22",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:codesys:plcwinnt:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4AD330AD-254E-4E3E-A17E-BE08305AFBA0",
"versionEndExcluding": "2.4.7.56",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:codesys:runtime_toolkit:*:*:*:*:*:*:x86:*",
"matchCriteriaId": "EC36E0FD-2487-4BA0-9EB8-174D30FD4DFB",
"versionEndExcluding": "2.4.7.56",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
},
{
"lang": "es",
"value": "Una petici\u00f3n dise\u00f1ada puede causar un acceso de lectura a un puntero no inicializado en CODESYS V2 Runtime Toolkit 32 Bit full y PLCWinNT versiones anteriores a V2.4.7.56, resultando en una condici\u00f3n de denegaci\u00f3n de servicio"
}
],
"id": "CVE-2021-34596",
"lastModified": "2025-08-15T20:24:15.653",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.0,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 8.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "info@cert.vde.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-10-26T10:15:08.127",
"references": [
{
"source": "info@cert.vde.com",
"tags": [
"Vendor Advisory"
],
"url": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16878\u0026token=e5644ec405590e66aefa62304cb8632df9fc9e9c\u0026download="
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://customers.codesys.com/index.php?eID=dumpFile\u0026t=f\u0026f=16878\u0026token=e5644ec405590e66aefa62304cb8632df9fc9e9c\u0026download="
}
],
"sourceIdentifier": "info@cert.vde.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-824"
}
],
"source": "info@cert.vde.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-27T13:55:23+00:00",
"cve": "CVE-2021-34596",
"id": "CVE-2021-34596",
"initial_release_date": "2021-10-25T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-34596.json",
"version": "3"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…