FKIE_CVE-2021-22876
Vulnerability from fkie_nvd - Published: 2021-04-01 18:15 - Updated: 2026-06-17 03:37
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 (Medium) - CVSS:3.1/
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| haxx | libcurl | * | |
| fedoraproject | fedora | 32 | |
| fedoraproject | fedora | 33 | |
| fedoraproject | fedora | 34 | |
| netapp | hci_management_node | - | |
| netapp | solidfire | - | |
| netapp | hci_compute_node | - | |
| netapp | hci_storage_node | - | |
| broadcom | fabric_operating_system | - | |
| debian | debian_linux | 9.0 | |
| siemens | sinec_infrastructure_network_services | * | |
| oracle | communications_billing_and_revenue_management | 12.0.0.3.0 | |
| oracle | essbase | 21.2 | |
| splunk | universal_forwarder | * | |
| splunk | universal_forwarder | * | |
| splunk | universal_forwarder | 9.1.0 |
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"vendor": "n/a",
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"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."
}
],
"id": "CVE-2021-22876",
"lastModified": "2026-06-17T03:37:55.703",
"metrics": {
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"baseSeverity": "MEDIUM",
"cvssData": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
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"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
"version": "2.0"
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"exploitabilityScore": 10.0,
"impactScore": 2.9,
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"obtainOtherPrivilege": false,
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"timestamp": "2025-06-09T14:54:20.546763Z",
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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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