When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.
https://hackerone.com/reports/1269242
https://www.oracle.com/security-alerts/cpuoct2021.html
https://security.netapp.com/advisory/ntap-20211029-0003/
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
https://support.apple.com/kb/HT213183
http://seclists.org/fulldisclosure/2022/Mar/29
Source: MITRE
Published: 2021-09-23
Updated: 2022-12-22
Type: CWE-415
Base Score: 5.8
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:P
Impact Score: 4.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 9.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Impact Score: 5.2
Exploitability Score: 3.9
Severity: CRITICAL