CVE-2021-22945

Public Exploit

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*.

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.57%
Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory gentoo.org
Affected: n/a https://github.com/curl/curl
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/1269242 patch third party advisory exploit
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/ vendor advisory mailing list third party advisory
https://www.oracle.com/security-alerts/cpuoct2021.html third party advisory patch
https://security.netapp.com/advisory/ntap-20211029-0003/ third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/ vendor advisory mailing list third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf third party advisory patch
https://support.apple.com/kb/HT213183 third party advisory
http://seclists.org/fulldisclosure/2022/Mar/29 third party advisory mailing list
https://www.debian.org/security/2022/dsa-5197 third party advisory vendor advisory
https://security.gentoo.org/glsa/202212-01 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-22945?
CVE-2021-22945 has been scored as a critical severity vulnerability.
How to fix CVE-2021-22945?
To fix CVE-2021-22945, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-22945 being actively exploited in the wild?
It is possible that CVE-2021-22945 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22945?
CVE-2021-22945 affects n/a https://github.com/curl/curl.
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