CVE-2021-22876 (GCVE-0-2021-22876)
Vulnerability from cvelistv5 – Published: 2021-04-01 17:45 – Updated: 2025-06-09 14:54
VLAI
EPSS
VEX
Summary
curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-09 14:54 UTC
CWE
- CWE-359 - Privacy Violation (CWE-359)
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1101882 | x_refsource_MISC |
| https://curl.se/docs/CVE-2021-22876.html | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://security.gentoo.org/glsa/202105-36 | vendor-advisoryx_refsource_GENTOO |
| https://www.oracle.com//security-alerts/cpujul2021.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021052… | x_refsource_CONFIRM |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | https://github.com/curl/curl |
Affected:
7.1.1 to and including 7.75.0
|
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-03T18:51:07.627Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://hackerone.com/reports/1101882"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://curl.se/docs/CVE-2021-22876.html"
},
{
"name": "FEDORA-2021-cab5c9befb",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/"
},
{
"name": "FEDORA-2021-065371f385",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/"
},
{
"name": "FEDORA-2021-26a293c72b",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/"
},
{
"name": "[debian-lts-announce] 20210517 [SECURITY] [DLA 2664-1] curl security update",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html"
},
{
"name": "GLSA-202105-36",
"tags": [
"vendor-advisory",
"x_refsource_GENTOO",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/202105-36"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20210521-0007/"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-22876",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-06-09T14:54:20.546763Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-06-09T14:54:59.891Z",
"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": "7.1.1 to and including 7.75.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "curl 7.1.1 to and including 7.75.0 is vulnerable to an \"Exposure of Private Personal Information to an Unauthorized Actor\" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-359",
"description": "Privacy Violation (CWE-359)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2022-03-08T14:06:57.000Z",
"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://hackerone.com/reports/1101882"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://curl.se/docs/CVE-2021-22876.html"
},
{
"name": "FEDORA-2021-cab5c9befb",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/"
},
{
"name": "FEDORA-2021-065371f385",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/"
},
{
"name": "FEDORA-2021-26a293c72b",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/"
},
{
"name": "[debian-lts-announce] 20210517 [SECURITY] [DLA 2664-1] curl security update",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html"
},
{
"name": "GLSA-202105-36",
"tags": [
"vendor-advisory",
"x_refsource_GENTOO"
],
"url": "https://security.gentoo.org/glsa/202105-36"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://security.netapp.com/advisory/ntap-20210521-0007/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "support@hackerone.com",
"ID": "CVE-2021-22876",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "https://github.com/curl/curl",
"version": {
"version_data": [
{
"version_value": "7.1.1 to and including 7.75.0"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "curl 7.1.1 to and including 7.75.0 is vulnerable to an \"Exposure of Private Personal Information to an Unauthorized Actor\" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "Privacy Violation (CWE-359)"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://hackerone.com/reports/1101882",
"refsource": "MISC",
"url": "https://hackerone.com/reports/1101882"
},
{
"name": "https://curl.se/docs/CVE-2021-22876.html",
"refsource": "MISC",
"url": "https://curl.se/docs/CVE-2021-22876.html"
},
{
"name": "FEDORA-2021-cab5c9befb",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/"
},
{
"name": "FEDORA-2021-065371f385",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/"
},
{
"name": "FEDORA-2021-26a293c72b",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/"
},
{
"name": "[debian-lts-announce] 20210517 [SECURITY] [DLA 2664-1] curl security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html"
},
{
"name": "GLSA-202105-36",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/202105-36"
},
{
"name": "https://www.oracle.com//security-alerts/cpujul2021.html",
"refsource": "MISC",
"url": "https://www.oracle.com//security-alerts/cpujul2021.html"
},
{
"name": "https://security.netapp.com/advisory/ntap-20210521-0007/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20210521-0007/"
},
{
"name": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
"refsource": "CONFIRM",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2021-22876",
"datePublished": "2021-04-01T17:45:18.000Z",
"dateReserved": "2021-01-06T00:00:00.000Z",
"dateUpdated": "2025-06-09T14:54:59.891Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-22876",
"date": "2026-09-17",
"epss": "0.05301",
"percentile": "0.92183"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2021-22876\",\"sourceIdentifier\":\"support@hackerone.com\",\"published\":\"2021-04-01T18:15:12.823\",\"lastModified\":\"2025-06-09T15:15:23.067\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"curl 7.1.1 to and including 7.75.0 is vulnerable to an \\\"Exposure of Private Personal Information to an Unauthorized Actor\\\" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.\"},{\"lang\":\"es\",\"value\":\"curl versiones 7.1.1 hasta 7.75.0 incluy\u00e9ndola, es vulnerable a una \\\"Exposure of Private Personal Information to an Unauthorized Actor\\\" al filtrar credenciales en el encabezado HTTP Referer:.\u0026#xa0;libcurl no elimina las credenciales de usuario de la URL cuando completa autom\u00e1ticamente el campo de encabezado de petici\u00f3n HTTP Referer: en peticiones HTTP salientes y, por lo tanto, corre el riesgo de filtrar datos confidenciales al servidor que es el objetivo de la segunda petici\u00f3n HTTP.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:N/A:N\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"support@hackerone.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-359\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-200\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.1.1\",\"versionEndIncluding\":\"7.75.0\",\"matchCriteriaId\":\"E7911980-1217-467C-8423-6D8928FACF70\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"36D96259-24BD-44E2-96D9-78CE1D41F956\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E460AA51-FCDA-46B9-AE97-E6676AA5E194\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A930E247-0B43-43CB-98FF-6CE7B8189835\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A3C19813-E823-456A-B1CE-EC0684CE1953\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A6E9EF0C-AFA8-4F7B-9FDC-1E0F7C26E737\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"AD7447BC-F315-4298-A822-549942FC118B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:h:netapp:hci_storage_node:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"02DEB4FB-A21D-4CB1-B522-EEE5093E8521\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:broadcom:fabric_operating_system:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"046FB51E-B768-44D3-AEB5-D857145CA840\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.0.1.1\",\"matchCriteriaId\":\"B0F46497-4AB0-49A7-9453-CC26837BF253\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_billing_and_revenue_management:12.0.0.3.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E39D442D-1997-49AF-8B02-5640BE2A26CC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:essbase:21.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"394A16F2-CCD4-44E5-BF6B-E0C782A9FA38\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"8.2.0\",\"versionEndExcluding\":\"8.2.12\",\"matchCriteriaId\":\"5722E753-75DE-4944-A11B-556CB299B57D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"9.0.0\",\"versionEndExcluding\":\"9.0.6\",\"matchCriteriaId\":\"DC0F9351-81A4-4FEA-B6B5-6E960A933D32\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"EED24E67-2957-4C1B-8FEA-E2D2FE7B97FC\"}]}]}],\"references\":[{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\",\"source\":\"support@hackerone.com\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://curl.se/docs/CVE-2021-22876.html\",\"source\":\"support@hackerone.com\",\"tags\":[\"Patch\",\"Vendor Advisory\"]},{\"url\":\"https://hackerone.com/reports/1101882\",\"source\":\"support@hackerone.com\",\"tags\":[\"Exploit\",\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html\",\"source\":\"support@hackerone.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/\",\"source\":\"support@hackerone.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/\",\"source\":\"support@hackerone.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/\",\"source\":\"support@hackerone.com\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202105-36\",\"source\":\"support@hackerone.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210521-0007/\",\"source\":\"support@hackerone.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com//security-alerts/cpujul2021.html\",\"source\":\"support@hackerone.com\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://curl.se/docs/CVE-2021-22876.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Vendor Advisory\"]},{\"url\":\"https://hackerone.com/reports/1101882\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/202105-36\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20210521-0007/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com//security-alerts/cpujul2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T12:04:06+00:00",
"cve": "CVE-2021-22876",
"id": "CVE-2021-22876",
"initial_release_date": "2021-03-31T00:00:00+00:00",
"product_status:fixed": "204",
"product_status:known_affected": "17",
"product_status:known_not_affected": "6",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "curl: Leak of authentication credentials in URL via automatic Referer",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-22876.json",
"version": "3"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://hackerone.com/reports/1101882\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://curl.se/docs/CVE-2021-22876.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/\", \"name\": \"FEDORA-2021-cab5c9befb\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/\", \"name\": \"FEDORA-2021-065371f385\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/\", \"name\": \"FEDORA-2021-26a293c72b\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\", \"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html\", \"name\": \"[debian-lts-announce] 20210517 [SECURITY] [DLA 2664-1] curl security update\", \"tags\": [\"mailing-list\", \"x_refsource_MLIST\", \"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/202105-36\", \"name\": \"GLSA-202105-36\", \"tags\": [\"vendor-advisory\", \"x_refsource_GENTOO\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210521-0007/\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T18:51:07.627Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-22876\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-06-09T14:54:20.546763Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-06-09T14:54:55.480Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"https://github.com/curl/curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.1.1 to and including 7.75.0\"}]}], \"references\": [{\"url\": \"https://hackerone.com/reports/1101882\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://curl.se/docs/CVE-2021-22876.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/\", \"name\": \"FEDORA-2021-cab5c9befb\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/\", \"name\": \"FEDORA-2021-065371f385\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/\", \"name\": \"FEDORA-2021-26a293c72b\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html\", \"name\": \"[debian-lts-announce] 20210517 [SECURITY] [DLA 2664-1] curl security update\", \"tags\": [\"mailing-list\", \"x_refsource_MLIST\"]}, {\"url\": \"https://security.gentoo.org/glsa/202105-36\", \"name\": \"GLSA-202105-36\", \"tags\": [\"vendor-advisory\", \"x_refsource_GENTOO\"]}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210521-0007/\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"curl 7.1.1 to and including 7.75.0 is vulnerable to an \\\"Exposure of Private Personal Information to an Unauthorized Actor\\\" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-359\", \"description\": \"Privacy Violation (CWE-359)\"}]}], \"providerMetadata\": {\"orgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"shortName\": \"hackerone\", \"dateUpdated\": \"2022-03-08T14:06:57.000Z\"}, \"x_legacyV4Record\": {\"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"version_value\": \"7.1.1 to and including 7.75.0\"}]}, \"product_name\": \"https://github.com/curl/curl\"}]}, \"vendor_name\": \"n/a\"}]}}, \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://hackerone.com/reports/1101882\", \"name\": \"https://hackerone.com/reports/1101882\", \"refsource\": \"MISC\"}, {\"url\": \"https://curl.se/docs/CVE-2021-22876.html\", \"name\": \"https://curl.se/docs/CVE-2021-22876.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/\", \"name\": \"FEDORA-2021-cab5c9befb\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/\", \"name\": \"FEDORA-2021-065371f385\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/\", \"name\": \"FEDORA-2021-26a293c72b\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html\", \"name\": \"[debian-lts-announce] 20210517 [SECURITY] [DLA 2664-1] curl security update\", \"refsource\": \"MLIST\"}, {\"url\": \"https://security.gentoo.org/glsa/202105-36\", \"name\": \"GLSA-202105-36\", \"refsource\": \"GENTOO\"}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\", \"name\": \"https://www.oracle.com//security-alerts/cpujul2021.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210521-0007/\", \"name\": \"https://security.netapp.com/advisory/ntap-20210521-0007/\", \"refsource\": \"CONFIRM\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\", \"name\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf\", \"refsource\": \"CONFIRM\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"curl 7.1.1 to and including 7.75.0 is vulnerable to an \\\"Exposure of Private Personal Information to an Unauthorized Actor\\\" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"Privacy Violation (CWE-359)\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-22876\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"support@hackerone.com\"}}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-22876\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-09T14:54:59.891Z\", \"dateReserved\": \"2021-01-06T00:00:00.000Z\", \"assignerOrgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"datePublished\": \"2021-04-01T17:45:18.000Z\", \"assignerShortName\": \"hackerone\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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…