CVE-2021-22946 (GCVE-0-2021-22946)
Vulnerability from cvelistv5 – Published: 2021-09-29 00:00 – Updated: 2026-10-14 11:29
VLAI
EPSS
VEX
Summary
A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 13:53 UTC
CWE
Assigner
References
19 references
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
curl 7.20.0 to and including 7.78.0
|
||
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed |
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"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"name": "FEDORA-2021-1d24845e93",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/"
},
{
"tags": [
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"tags": [
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20211029-0003/"
},
{
"tags": [
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0008/"
},
{
"name": "20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3",
"tags": [
"mailing-list",
"x_transferred"
],
"url": "http://seclists.org/fulldisclosure/2022/Mar/29"
},
{
"tags": [
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"tags": [
"x_transferred"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
},
{
"tags": [
"x_transferred"
],
"url": "https://support.apple.com/kb/HT213183"
},
{
"tags": [
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpujul2022.html"
},
{
"name": "DSA-5197",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://www.debian.org/security/2022/dsa-5197"
},
{
"name": "[debian-lts-announce] 20220828 [SECURITY] [DLA 3085-1] curl security update",
"tags": [
"mailing-list",
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"
},
{
"name": "GLSA-202212-01",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/202212-01"
}
],
"title": "CVE Program Container"
},
{
"affected": [
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V3.1.5",
"status": "affected",
"version": "V3.1.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V3.1.5",
"status": "affected",
"version": "V3.1.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V3.1.5",
"status": "affected",
"version": "V3.1.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V3.1.5",
"status": "affected",
"version": "V3.1.0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V3.1.5",
"status": "affected",
"version": "V3.1.0",
"versionType": "custom"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-14T11:29:20.323Z",
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP"
},
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-389290.html"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-146325.html"
},
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
}
],
"x_adpType": "supplier"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-22946",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-16T13:53:35.942299Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-319",
"description": "CWE-319 Cleartext Transmission of Sensitive Information",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-16T13:52:56.114Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "https://github.com/curl/curl",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "curl 7.20.0 to and including 7.78.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A user can tell curl \u003e= 7.20.0 and \u003c= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-325",
"description": "Missing Required Cryptographic Step (CWE-325)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2022-12-19T00:00:00.000Z",
"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
},
"references": [
{
"url": "https://hackerone.com/reports/1334111"
},
{
"name": "[debian-lts-announce] 20210930 [SECURITY] [DLA 2773-1] curl security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html"
},
{
"name": "FEDORA-2021-fc96a3a749",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/"
},
{
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"name": "FEDORA-2021-1d24845e93",
"tags": [
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],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/"
},
{
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"url": "https://security.netapp.com/advisory/ntap-20211029-0003/"
},
{
"url": "https://security.netapp.com/advisory/ntap-20220121-0008/"
},
{
"name": "20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3",
"tags": [
"mailing-list"
],
"url": "http://seclists.org/fulldisclosure/2022/Mar/29"
},
{
"url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
},
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
},
{
"url": "https://support.apple.com/kb/HT213183"
},
{
"url": "https://www.oracle.com/security-alerts/cpujul2022.html"
},
{
"name": "DSA-5197",
"tags": [
"vendor-advisory"
],
"url": "https://www.debian.org/security/2022/dsa-5197"
},
{
"name": "[debian-lts-announce] 20220828 [SECURITY] [DLA 3085-1] curl security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"
},
{
"name": "GLSA-202212-01",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202212-01"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2021-22946",
"datePublished": "2021-09-29T00:00:00.000Z",
"dateReserved": "2021-01-06T00:00:00.000Z",
"dateUpdated": "2026-10-14T11:29:20.323Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.