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CVE-2021-22926 (GCVE-0-2021-22926)

Vulnerability from cvelistv5 – Published: 2021-08-05 00:00 – Updated: 2026-05-28 19:49
VLAI
Summary
libcurl-using applications can ask for a specific client certificate to be used in a transfer. This is done with the `CURLOPT_SSLCERT` option (`--cert` with the command line tool).When libcurl is built to use the macOS native TLS library Secure Transport, an application can ask for the client certificate by name or with a file name - using the same option. If the name exists as a file, it will be used instead of by name.If the appliction runs with a current working directory that is writable by other users (like `/tmp`), a malicious user can create a file name with the same name as the app wants to use by name, and thereby trick the application to use the file based cert instead of the one referred to by name making libcurl send the wrong client certificate in the TLS connection handshake.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-28 19:49 UTC
CWE
  • CWE-840 - Business Logic Errors (CWE-840)
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a https://github.com/curl/curl Affected: curll 7.33.0 to and include 7.77.0
Show details on NVD website
To clipboard 

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          "value": "Las aplicaciones que usan libcurl pueden pedir un certificado de cliente espec\u00edfico para ser usado en una transferencia. Esto se hace con la opci\u00f3n \"CURLOPT_SSLCERT\" (\"--cert\" con la herramienta de l\u00ednea de comandos).Cuando libcurl se construye para usar la biblioteca TLS nativa de macOS Transporte Seguro, una aplicaci\u00f3n puede pedir el certificado del cliente por su nombre o con un nombre de archivo - usando la misma opci\u00f3n. Si la aplicaci\u00f3n se ejecuta con un directorio de trabajo actual que puede ser escrito por otros usuarios (como \"/tmp\"), un usuario malintencionado puede crear un nombre de archivo con el mismo nombre que la aplicaci\u00f3n quiere usar por nombre, y as\u00ed enga\u00f1ar a la aplicaci\u00f3n para que use el certificado basado en el archivo en lugar del referido por nombre, haciendo que libcurl env\u00ede el certificado de cliente incorrecto en el handshake de la conexi\u00f3n TLS"
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}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.