Vulnerability Intelligence

CVE-2021-22926

High 7.5

Published
Last modified
NVD status
Modified

Description

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.

Affected products

haxx: curl; netapp: active iq unified manager; netapp: clustered data ontap; netapp: hci management node; netapp: oncommand insight; netapp: oncommand workflow automation; netapp: snapcenter; netapp: solidfire; oracle: mysql server; oracle: peoplesoft enterprise peopletools; siemens: sinec infrastructure network services; netapp: h300s firmware; netapp: h300s; netapp: h300e firmware; netapp: h300e

References10

Metrics

CVSS 3.1
7.5 HIGH Score source: NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — exploit probability
15% percentile: 97 · as of 4 November 2026
CWE
CWE-840CWE-295

Could this be exploited in your environment?

A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.

Request a pentest