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*.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (6.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a 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*.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 6.68% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-415
- Affected
- haxx/libcurl · fedoraproject/fedora · netapp/cloud backup · netapp/clustered data ontap · oracle/mysql server · netapp/h300s firmware · netapp/h500s firmware · netapp/h700s firmware · netapp/h300e firmware · netapp/h500e firmware · netapp/h700e firmware · netapp/h410s firmware · netapp/solidfire baseboard management controller firmware · apple/macos · siemens/sinec ins · debian/debian linux · splunk/universal forwarder
- Source
- support@hackerone.com
EPSS 6.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
- https://cert-portal.siemens.com/productcert/html/ssa-389290.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.