CVE-2020-26143 (GCVE-0-2020-26143)
Vulnerability from cvelistv5 – Published: 2021-05-11 19:36 – Updated: 2026-04-14 08:49
VLAI
EPSS
VEX
Summary
An issue was discovered in the ALFA Windows 10 driver 1030.36.604 for AWUS036ACH. The WEP, WPA, WPA2, and WPA3 implementations accept fragmented plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.
Severity
6.5 (Medium)
CWE
- n/a
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://tools.cisco.com/security/center/content/C… | vendor-advisoryx_refsource_CISCO |
| https://www.fragattacks.com | x_refsource_MISC |
| https://github.com/vanhoefm/fragattacks/blob/mast… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2021/0… | mailing-listx_refsource_MLIST |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://www.arista.com/en/support/advisories-noti… | x_refsource_MISC |
| https://cert-portal.siemens.com/productcert/html/… | |
| https://cert-portal.siemens.com/productcert/html/… |
Impacted products
23 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Siemens | SCALANCE W721-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W722-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W734-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W734-1 RJ45 (USA) |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W738-1 M12 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W748-1 M12 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W748-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W761-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W774-1 M12 EEC |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W774-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W774-1 RJ45 (USA) |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W778-1 M12 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W778-1 M12 EEC |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W778-1 M12 EEC (USA) |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W786-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W786-2 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W786-2 SFP |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W786-2IA RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W788-1 M12 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W788-1 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W788-2 M12 |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W788-2 M12 EEC |
Affected:
0 , < V6.6.0
(custom)
|
guessed | |
| Siemens | SCALANCE W788-2 RJ45 |
Affected:
0 , < V6.6.0
(custom)
|
guessed |
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T15:49:07.234Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
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"references": [
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"name": "20210511 Multiple Vulnerabilities in Frame Aggregation and Fragmentation Implementations of 802.11 Specification Affecting Cisco Products: May 2021",
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"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63"
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"title": "CVE Program Container"
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{
"affected": [
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W722-1 RJ45",
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"versions": [
{
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"status": "affected",
"version": "0",
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},
{
"defaultStatus": "unknown",
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"vendor": "Siemens",
"versions": [
{
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W722-1 RJ45",
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"versions": [
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"lessThan": "V6.6.0",
"status": "affected",
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W722-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W722-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W722-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W734-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W734-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
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{
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{
"defaultStatus": "unknown",
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"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
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]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W734-1 RJ45 (USA)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W734-1 RJ45 (USA)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W738-1 M12",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W738-1 M12",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
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{
"defaultStatus": "unknown",
"product": "SCALANCE W738-1 M12",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W738-1 M12",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W748-1 M12",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W748-1 M12",
"vendor": "Siemens",
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{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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{
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"vendor": "Siemens",
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{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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},
{
"defaultStatus": "unknown",
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"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W748-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
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{
"defaultStatus": "unknown",
"product": "SCALANCE W748-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
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},
{
"defaultStatus": "unknown",
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"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W748-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
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},
{
"defaultStatus": "unknown",
"product": "SCALANCE W761-1 RJ45",
"vendor": "Siemens",
"versions": [
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{
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"versions": [
{
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"version": "0",
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]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 M12 EEC",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
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}
]
},
{
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}
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},
{
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"product": "SCALANCE W774-1 M12 EEC",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 M12 EEC",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
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}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
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}
]
},
{
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"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
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}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W774-1 RJ45 (USA)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
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]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W778-1 M12",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
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"vendor": "Siemens",
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{
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"product": "SCALANCE W778-1 M12",
"vendor": "Siemens",
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{
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"version": "0",
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}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W778-1 M12",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
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}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W778-1 M12 EEC",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
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}
]
},
{
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"product": "SCALANCE W778-1 M12 EEC",
"vendor": "Siemens",
"versions": [
{
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}
]
},
{
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"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
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]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W778-1 M12 EEC (USA)",
"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W786-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W786-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W786-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W786-1 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W786-2 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SCALANCE W786-2 RJ45",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V6.6.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
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{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.fragattacks.com"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "http://www.openwall.com/lists/oss-security/2021/05/11/12"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://www.fragattacks.com"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019200.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-913875.html"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-20"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T11:48:14+00:00",
"cve": "CVE-2020-26143",
"id": "CVE-2020-26143",
"initial_release_date": "2020-01-01T00:00:00+00:00",
"product_status:fixed": "150",
"product_status:known_affected": "44",
"product_status:known_not_affected": "106",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: accepting fragmented plaintext frames in protected networks",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-26143.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
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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.