# CVE-2021-22947: Open Source Curl Remote Code Execution Vulnerability CVE-2021-22947 is fixed in 28 products on 2 platforms, first by curl 7.58.0-2ubuntu3.15, released September 14, 2021. It is not reported as exploited. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2021-22947 - Priority: Urgent - CVSS: 6.1 (Critical) - EPSS: 0.0301 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: yes - Vendor exploitability assessment: Exploitation Less Likely - Published: Sep 14, 2021 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-22947 ## Description The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP. Security Fix(es): * curl: Requirement to use TLS not properly enforced for IMAP, POP3, and FTP protocols (CVE-2021-22946) * curl: Server responses received before STARTTLS processed after TLS handshake (CVE-2021-22947) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.2452 | [KB5009557](https://patchblox.com/security/data/fix/microsoft/kb5009557.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.2452 | [KB5009557](https://patchblox.com/security/data/fix/microsoft/kb5009557.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.2452 | [KB5009557](https://patchblox.com/security/data/fix/microsoft/kb5009557.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 1909 for 32-bit Systems | 18363.2037 | [KB5009545](https://patchblox.com/security/data/fix/microsoft/kb5009545.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 1909 for ARM64-based Systems | 18363.2037 | [KB5009545](https://patchblox.com/security/data/fix/microsoft/kb5009545.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 1909 for x64-based Systems | 18363.2037 | [KB5009545](https://patchblox.com/security/data/fix/microsoft/kb5009545.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 20H2 for 32-bit Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 20H2 for ARM64-based Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 21H1 for 32-bit Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 21H1 for ARM64-based Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 21H1 for x64-based Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 21H2 for 32-bit Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 21H2 for ARM64-based Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 10 Version 21H2 for x64-based Systems | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Microsoft | Windows 11 version 21H2 for ARM64-based Systems | 22000.434 | [KB5009566](https://patchblox.com/security/data/fix/microsoft/kb5009566.md) | Jan 11, 2022 | | Microsoft | Windows 11 version 21H2 for x64-based Systems | 22000.434 | [KB5009566](https://patchblox.com/security/data/fix/microsoft/kb5009566.md) | Jan 11, 2022 | | Microsoft | Windows Server 2019 | 17763.2452 | [KB5009557](https://patchblox.com/security/data/fix/microsoft/kb5009557.md) | Jan 11, 2022 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.2452 | [KB5009557](https://patchblox.com/security/data/fix/microsoft/kb5009557.md) | Jan 11, 2022 | | Microsoft | Windows Server 2022 | 20348.469 | [KB5009555](https://patchblox.com/security/data/fix/microsoft/kb5009555.md) | Jan 11, 2022 | | Microsoft | Windows Server 2022 (Server Core installation) | 20348.469 | [KB5009555](https://patchblox.com/security/data/fix/microsoft/kb5009555.md) | Jan 11, 2022 | | Microsoft | Windows Server, version 20H2 (Server Core Installation) | | [KB5009543](https://patchblox.com/security/data/fix/microsoft/kb5009543.md) | Jan 11, 2022 | | Linux | curl RHEL 8 | 0:7.61.1-18.el8_4.2 | [RHSA-2021:4059](https://patchblox.com/security/data/fix/linux/rhsa-2021-4059.md) | Nov 2, 2021 | | Linux | curl Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.15 | [curl 7.58.0-2ubuntu3.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-curl-7.58.0-2ubuntu3.15.md) | Sep 14, 2021 | | Linux | curl Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.7 | [curl 7.68.0-1ubuntu2.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-curl-7.68.0-1ubuntu2.7.md) | Sep 14, 2021 | | Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.74.0-1.3ubuntu2 | [curl 7.74.0-1.3ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.74.0-1.3ubuntu2.md) | Sep 14, 2021 | | Linux | curl ol 8 | 0:7.61.1-18.el8_4.2 | [ELSA-2021-4059](https://patchblox.com/security/data/fix/linux/elsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl RHEL 8 | 0:7.61.1-18.el8_4.2 | [RHSA-2021:4059](https://patchblox.com/security/data/fix/linux/rhsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl ol 8 | 0:7.61.1-18.el8_4.2 | [ELSA-2021-4059](https://patchblox.com/security/data/fix/linux/elsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl-devel RHEL 8 | 0:7.61.1-18.el8_4.2 | [RHSA-2021:4059](https://patchblox.com/security/data/fix/linux/rhsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl-devel ol 8 | 0:7.61.1-18.el8_4.2 | [ELSA-2021-4059](https://patchblox.com/security/data/fix/linux/elsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl-minimal RHEL 8 | 0:7.61.1-18.el8_4.2 | [RHSA-2021:4059](https://patchblox.com/security/data/fix/linux/rhsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl-minimal ol 8 | 0:7.61.1-18.el8_4.2 | [ELSA-2021-4059](https://patchblox.com/security/data/fix/linux/elsa-2021-4059.md) | Nov 2, 2021 | | Linux | libcurl3-gnutls Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.15 | [libcurl3-gnutls 7.58.0-2ubuntu3.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-gnutls-7.58.0-2ubuntu3.15.md) | Sep 14, 2021 | | Linux | libcurl3-gnutls Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.7 | [libcurl3-gnutls 7.68.0-1ubuntu2.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-gnutls-7.68.0-1ubuntu2.7.md) | Sep 14, 2021 | | Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.74.0-1.3ubuntu2 | [libcurl3-gnutls 7.74.0-1.3ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.74.0-1.3ubuntu2.md) | Sep 14, 2021 | | Linux | libcurl3-nss Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.15 | [libcurl3-nss 7.58.0-2ubuntu3.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl3-nss-7.58.0-2ubuntu3.15.md) | Sep 14, 2021 | | Linux | libcurl3-nss Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.7 | [libcurl3-nss 7.68.0-1ubuntu2.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl3-nss-7.68.0-1ubuntu2.7.md) | Sep 14, 2021 | | Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.74.0-1.3ubuntu2 | [libcurl3-nss 7.74.0-1.3ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.74.0-1.3ubuntu2.md) | Sep 14, 2021 | | Linux | libcurl4 Ubuntu 18.04.6 LTS (bionic) | 7.58.0-2ubuntu3.15 | [libcurl4 7.58.0-2ubuntu3.15](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libcurl4-7.58.0-2ubuntu3.15.md) | Sep 14, 2021 | | Linux | libcurl4 Ubuntu 20.04 LTS (focal) | 7.68.0-1ubuntu2.7 | [libcurl4 7.68.0-1ubuntu2.7](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libcurl4-7.68.0-1ubuntu2.7.md) | Sep 14, 2021 | | Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.74.0-1.3ubuntu2 | [libcurl4 7.74.0-1.3ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.74.0-1.3ubuntu2.md) | Sep 14, 2021 | --- Data as of 2026-11-08T13:06:02Z UTC. 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