Detections
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CVE-2021-22945

critical

Description

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*.

References

https://www.oracle.com/security-alerts/cpuoct2021.html

https://www.debian.org/security/2022/dsa-5197

https://support.apple.com/kb/HT213183

https://security.netapp.com/advisory/ntap-20211029-0003/

https://security.gentoo.org/glsa/202212-01

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/

https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

http://seclists.org/fulldisclosure/2022/Mar/29

https://hackerone.com/reports/1269242

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-10073

https://cert-portal.siemens.com/productcert/html/ssa-398330.html

https://cert-portal.siemens.com/productcert/html/ssa-389290.html

Details

Source: Mitre, NVD

Published: 2021-09-23

Updated: 2026-10-14

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 9.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Severity: Critical

EPSS

EPSS: 0.06677