CVE-2021-22945
CRITICALCVSS 9.1/10EPSS 6.22%
Last modified
CVE-2021-22945 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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*.. EPSS estimates a 6.22% chance of exploitation in the next 30 days.
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*.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Libcurl | >= 7.73.0, <= 7.78.0 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 35 |
| Netapp | Cloud Backup | All versions |
| Netapp | Clustered Data Ontap | All versions |
| Oracle | Mysql Server | >= 5.7.0, <= 5.7.35 |
| Oracle | Mysql Server | >= 8.0.0, <= 8.0.26 |
| Netapp | H300s Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H700s Firmware | All versions |
| Netapp | H300e Firmware | All versions |
| Netapp | H500e Firmware | All versions |
| Netapp | H700e Firmware | All versions |
| Netapp | H410s Firmware | All versions |
| Netapp | Solidfire Baseboard Management Controller Firmware | All versions |
| Apple | Macos | >= 12.0.0, < 12.3 |
| Siemens | Sinec Ins | < 1.0.1.1 |
| Debian | Debian Linux | 11.0 |
| Splunk | Universal Forwarder | >= 8.2.0, < 8.2.12 |
| Splunk | Universal Forwarder | >= 9.0.0, < 9.0.6 |
| Splunk | Universal Forwarder | 9.1.0 |
References
- http://seclists.org/fulldisclosure/2022/Mar/29Mailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
- https://hackerone.com/reports/1269242Exploit, Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202212-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211029-0003/Third Party Advisory
- https://support.apple.com/kb/HT213183Third Party Advisory
- https://www.debian.org/security/2022/dsa-5197Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- http://seclists.org/fulldisclosure/2022/Mar/29Mailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
- https://hackerone.com/reports/1269242Exploit, Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202212-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211029-0003/Third Party Advisory
- https://support.apple.com/kb/HT213183Third Party Advisory
- https://www.debian.org/security/2022/dsa-5197Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-22945?
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*.
How severe is CVE-2021-22945?
CVE-2021-22945 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 6.22% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22945?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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