# CVE-2022-43552: Open Source Curl Remote Code Execution Vulnerability

CVE-2022-43552 is fixed in 32 products on 2 platforms, first by curl 7.58.0-2ubuntu3.22, released December 20, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-43552
- Priority: Routine
- CVSS: 5.9 (Important)
- EPSS: 0.0271
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Published: Dec 20, 2022
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-43552

## Description

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to *tunnel* virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.4252 | [KB5025229](https://patchblox.com/security/data/fix/microsoft/kb5025229.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.4252 | [KB5025229](https://patchblox.com/security/data/fix/microsoft/kb5025229.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.4252 | [KB5025229](https://patchblox.com/security/data/fix/microsoft/kb5025229.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 20H2 for 32-bit Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 20H2 for ARM64-based Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 21H2 for 32-bit Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 21H2 for x64-based Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 22H2 for 32-bit Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 22H2 for ARM64-based Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 10 Version 22H2 for x64-based Systems |  | [KB5025221](https://patchblox.com/security/data/fix/microsoft/kb5025221.md) | Apr 11, 2023 |
| Microsoft | Windows 11 Version 22H2 for ARM64-based Systems | 22621.1555 | [KB5025239](https://patchblox.com/security/data/fix/microsoft/kb5025239.md) | Apr 11, 2023 |
| Microsoft | Windows 11 Version 22H2 for x64-based Systems | 22621.1555 | [KB5025239](https://patchblox.com/security/data/fix/microsoft/kb5025239.md) | Apr 11, 2023 |
| Microsoft | Windows 11 version 21H2 for ARM64-based Systems | 22000.1817 | [KB5025224](https://patchblox.com/security/data/fix/microsoft/kb5025224.md) | Apr 11, 2023 |
| Microsoft | Windows 11 version 21H2 for x64-based Systems | 22000.1817 | [KB5025224](https://patchblox.com/security/data/fix/microsoft/kb5025224.md) | Apr 11, 2023 |
| Microsoft | Windows Server 2019 | 17763.4252 | [KB5025229](https://patchblox.com/security/data/fix/microsoft/kb5025229.md) | Apr 11, 2023 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.4252 | [KB5025229](https://patchblox.com/security/data/fix/microsoft/kb5025229.md) | Apr 11, 2023 |
| Microsoft | Windows Server 2022 | 20348.1668 | [KB5025230](https://patchblox.com/security/data/fix/microsoft/kb5025230.md) | Apr 11, 2023 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.1668 | [KB5025230](https://patchblox.com/security/data/fix/microsoft/kb5025230.md) | Apr 11, 2023 |
| Linux | curl Debian 12.15 (bookworm) | 7.86.0-3 | [DEBIAN-CVE-2022-43552](https://patchblox.com/security/data/fix/linux/debian-cve-2022-43552.md) | Feb 9, 2023 |
| Linux | curl Debian 13.5 (trixie) | 7.86.0-3 | [DEBIAN-CVE-2022-43552](https://patchblox.com/security/data/fix/linux/debian-cve-2022-43552.md) | Feb 9, 2023 |
| Linux | curl Debian 14 | 7.86.0-3 | [DEBIAN-CVE-2022-43552](https://patchblox.com/security/data/fix/linux/debian-cve-2022-43552.md) | Feb 9, 2023 |
| Linux | curl RHEL 8 | 0:7.61.1-30.el8 | [RHSA-2023:2963](https://patchblox.com/security/data/fix/linux/rhsa-2023-2963.md) | May 16, 2023 |
| Linux | curl RHEL 9 | 0:7.76.1-23.el9 | [RHSA-2023:2478](https://patchblox.com/security/data/fix/linux/rhsa-2023-2478.md) | May 9, 2023 |
| Linux | curl Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.22 | [curl 7.58.0-2ubuntu3.22](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-curl-7.58.0-2ubuntu3.22.md) | Dec 20, 2022 |
| Linux | curl Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.15 | [curl 7.68.0-1ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-curl-7.68.0-1ubuntu2.15.md) | Dec 20, 2022 |
| Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | [curl 7.81.0-1ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.7.md) | Dec 20, 2022 |
| Linux | curl almalinux 8 | 7.61.1-30.el8 | [ALSA-2023:2963](https://patchblox.com/security/data/fix/linux/alsa-2023-2963.md) | May 16, 2023 |
| Linux | curl almalinux 9 | 7.76.1-23.el9 | [ALSA-2023:2478](https://patchblox.com/security/data/fix/linux/alsa-2023-2478.md) | May 9, 2023 |
| Linux | curl amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl ol 8 | 0:7.61.1-30.el8 | [ELSA-2023-2963](https://patchblox.com/security/data/fix/linux/elsa-2023-2963.md) | May 24, 2023 |
| Linux | curl ol 9 | 0:7.76.1-23.el9 | [ELSA-2023-2478](https://patchblox.com/security/data/fix/linux/elsa-2023-2478.md) | May 15, 2023 |
| Linux | curl-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-debugsource amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-minimal RHEL 9 | 0:7.76.1-23.el9 | [RHSA-2023:2478](https://patchblox.com/security/data/fix/linux/rhsa-2023-2478.md) | May 9, 2023 |
| Linux | curl-minimal almalinux 9 | 7.76.1-23.el9 | [ALSA-2023:2478](https://patchblox.com/security/data/fix/linux/alsa-2023-2478.md) | May 9, 2023 |
| Linux | curl-minimal amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-minimal ol 9 | 0:7.76.1-23.el9 | [ELSA-2023-2478](https://patchblox.com/security/data/fix/linux/elsa-2023-2478.md) | May 15, 2023 |
| Linux | curl-minimal-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl RHEL 8 | 0:7.61.1-30.el8 | [RHSA-2023:2963](https://patchblox.com/security/data/fix/linux/rhsa-2023-2963.md) | May 16, 2023 |
| Linux | libcurl RHEL 9 | 0:7.76.1-23.el9 | [RHSA-2023:2478](https://patchblox.com/security/data/fix/linux/rhsa-2023-2478.md) | May 9, 2023 |
| Linux | libcurl almalinux 8 | 7.61.1-30.el8 | [ALSA-2023:2963](https://patchblox.com/security/data/fix/linux/alsa-2023-2963.md) | May 16, 2023 |
| Linux | libcurl almalinux 9 | 7.76.1-23.el9 | [ALSA-2023:2478](https://patchblox.com/security/data/fix/linux/alsa-2023-2478.md) | May 9, 2023 |
| Linux | libcurl amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl ol 8 | 0:7.61.1-30.el8 | [ELSA-2023-2963](https://patchblox.com/security/data/fix/linux/elsa-2023-2963.md) | May 24, 2023 |
| Linux | libcurl ol 9 | 0:7.76.1-23.el9 | [ELSA-2023-2478](https://patchblox.com/security/data/fix/linux/elsa-2023-2478.md) | May 15, 2023 |
| Linux | libcurl-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-devel RHEL 8 | 0:7.61.1-30.el8 | [RHSA-2023:2963](https://patchblox.com/security/data/fix/linux/rhsa-2023-2963.md) | May 16, 2023 |
| Linux | libcurl-devel RHEL 9 | 0:7.76.1-23.el9 | [RHSA-2023:2478](https://patchblox.com/security/data/fix/linux/rhsa-2023-2478.md) | May 9, 2023 |
| Linux | libcurl-devel almalinux 8 | 7.61.1-30.el8 | [ALSA-2023:2963](https://patchblox.com/security/data/fix/linux/alsa-2023-2963.md) | May 16, 2023 |
| Linux | libcurl-devel almalinux 9 | 7.76.1-23.el9 | [ALSA-2023:2478](https://patchblox.com/security/data/fix/linux/alsa-2023-2478.md) | May 9, 2023 |
| Linux | libcurl-devel amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-devel ol 8 | 0:7.61.1-30.el8 | [ELSA-2023-2963](https://patchblox.com/security/data/fix/linux/elsa-2023-2963.md) | May 24, 2023 |
| Linux | libcurl-devel ol 9 | 0:7.76.1-23.el9 | [ELSA-2023-2478](https://patchblox.com/security/data/fix/linux/elsa-2023-2478.md) | May 15, 2023 |
| Linux | libcurl-minimal RHEL 8 | 0:7.61.1-30.el8 | [RHSA-2023:2963](https://patchblox.com/security/data/fix/linux/rhsa-2023-2963.md) | May 16, 2023 |
| Linux | libcurl-minimal RHEL 9 | 0:7.76.1-23.el9 | [RHSA-2023:2478](https://patchblox.com/security/data/fix/linux/rhsa-2023-2478.md) | May 9, 2023 |
| Linux | libcurl-minimal almalinux 8 | 7.61.1-30.el8 | [ALSA-2023:2963](https://patchblox.com/security/data/fix/linux/alsa-2023-2963.md) | May 16, 2023 |
| Linux | libcurl-minimal almalinux 9 | 7.76.1-23.el9 | [ALSA-2023:2478](https://patchblox.com/security/data/fix/linux/alsa-2023-2478.md) | May 9, 2023 |
| Linux | libcurl-minimal amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-minimal ol 8 | 0:7.61.1-30.el8 | [ELSA-2023-2963](https://patchblox.com/security/data/fix/linux/elsa-2023-2963.md) | May 24, 2023 |
| Linux | libcurl-minimal ol 9 | 0:7.76.1-23.el9 | [ELSA-2023-2478](https://patchblox.com/security/data/fix/linux/elsa-2023-2478.md) | May 15, 2023 |
| Linux | libcurl-minimal-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl3-gnutls Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.22 | [libcurl3-gnutls 7.58.0-2ubuntu3.22](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-gnutls-7.58.0-2ubuntu3.22.md) | Dec 20, 2022 |
| Linux | libcurl3-gnutls Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.15 | [libcurl3-gnutls 7.68.0-1ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-gnutls-7.68.0-1ubuntu2.15.md) | Dec 20, 2022 |
| Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | [libcurl3-gnutls 7.81.0-1ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.7.md) | Dec 20, 2022 |
| Linux | libcurl3-nss Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.22 | [libcurl3-nss 7.58.0-2ubuntu3.22](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-nss-7.58.0-2ubuntu3.22.md) | Dec 20, 2022 |
| Linux | libcurl3-nss Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.15 | [libcurl3-nss 7.68.0-1ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-nss-7.68.0-1ubuntu2.15.md) | Dec 20, 2022 |
| Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | [libcurl3-nss 7.81.0-1ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.7.md) | Dec 20, 2022 |
| Linux | libcurl4 Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.22 | [libcurl4 7.58.0-2ubuntu3.22](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl4-7.58.0-2ubuntu3.22.md) | Dec 20, 2022 |
| Linux | libcurl4 Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.15 | [libcurl4 7.68.0-1ubuntu2.15](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl4-7.68.0-1ubuntu2.15.md) | Dec 20, 2022 |
| Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.7 | [libcurl4 7.81.0-1ubuntu1.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.7.md) | Dec 20, 2022 |

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