CVE-2021-22946 (GCVE-0-2021-22946)
Vulnerability from cvelistv5 – Published: 2021-09-29 00:00 – Updated: 2026-04-16 13:53
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
16 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
curl 7.20.0 to and including 7.78.0
|
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"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": [
"vendor-advisory"
],
"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": "2026-04-16T13:53:47.481Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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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.
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