# CVE-2024-6197: Hackerone: CVE-2024-6197 Freeing stack buffer in utf8asn1str CVE-2024-6197 is fixed in 24 products on 2 platforms, first by DEBIAN-CVE-2024-6197, released July 24, 2024. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2024-6197 - Priority: High - CVSS: 8.8 (Important) - EPSS: 0.0430 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: yes - Vendor exploitability assessment: Exploitation Less Likely - Published: Jul 24, 2024 - Weakness: Free of Memory not on the Heap - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-6197 ## Description libcurl's ASN1 parser has this utf8asn1str() function used for parsing anASN.1 UTF-8 string. Itcan detect an invalid field and return error.Unfortunately, when doing so it also invokes `free()` on a 4 bytelocalstack buffer. Most modern malloc implementations detect this errorand immediately abort. Some however accept the input pointer and add thatmemory to its list of available chunks. This leads to the overwriting ofnearby stack memory. The content of the overwrite is decided by the`free()` implementation; likely to be memory pointers and a set of flags.The most likely outcome of exploting this flaw is a crash, although itcannot be ruled out that more serious results can be had in specialcircumstances. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.6414 | [KB5044277](https://patchblox.com/security/data/fix/microsoft/kb5044277.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.6414 | [KB5044277](https://patchblox.com/security/data/fix/microsoft/kb5044277.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 21H2 for 32-bit Systems | | [KB5044273](https://patchblox.com/security/data/fix/microsoft/kb5044273.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 21H2 for ARM64-based Systems | | [KB5044273](https://patchblox.com/security/data/fix/microsoft/kb5044273.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 21H2 for x64-based Systems | | [KB5044273](https://patchblox.com/security/data/fix/microsoft/kb5044273.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 22H2 for 32-bit Systems | | [KB5044273](https://patchblox.com/security/data/fix/microsoft/kb5044273.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 22H2 for ARM64-based Systems | | [KB5044273](https://patchblox.com/security/data/fix/microsoft/kb5044273.md) | Oct 8, 2024 | | Microsoft | Windows 10 Version 22H2 for x64-based Systems | | [KB5044273](https://patchblox.com/security/data/fix/microsoft/kb5044273.md) | Oct 8, 2024 | | Microsoft | Windows 11 Version 22H2 for ARM64-based Systems | | [KB5044285](https://patchblox.com/security/data/fix/microsoft/kb5044285.md) | Oct 8, 2024 | | Microsoft | Windows 11 Version 22H2 for x64-based Systems | | [KB5044285](https://patchblox.com/security/data/fix/microsoft/kb5044285.md) | Oct 8, 2024 | | Microsoft | Windows 11 Version 23H2 for ARM64-based Systems | | [KB5044285](https://patchblox.com/security/data/fix/microsoft/kb5044285.md) | Oct 8, 2024 | | Microsoft | Windows 11 Version 23H2 for x64-based Systems | | [KB5044285](https://patchblox.com/security/data/fix/microsoft/kb5044285.md) | Oct 8, 2024 | | Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | 26100.2033 | [KB5044284](https://patchblox.com/security/data/fix/microsoft/kb5044284.md) | Oct 8, 2024 | | Microsoft | Windows 11 Version 24H2 for x64-based Systems | 26100.2033 | [KB5044284](https://patchblox.com/security/data/fix/microsoft/kb5044284.md) | Oct 8, 2024 | | Microsoft | Windows 11 version 21H2 for ARM64-based Systems | 22000.3260 | [KB5044280](https://patchblox.com/security/data/fix/microsoft/kb5044280.md) | Oct 8, 2024 | | Microsoft | Windows 11 version 21H2 for x64-based Systems | 22000.3260 | [KB5044280](https://patchblox.com/security/data/fix/microsoft/kb5044280.md) | Oct 8, 2024 | | Microsoft | Windows Server 2019 | 17763.6414 | [KB5044277](https://patchblox.com/security/data/fix/microsoft/kb5044277.md) | Oct 8, 2024 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.6414 | [KB5044277](https://patchblox.com/security/data/fix/microsoft/kb5044277.md) | Oct 8, 2024 | | Microsoft | Windows Server 2022 | 20348.2762 | [KB5044281](https://patchblox.com/security/data/fix/microsoft/kb5044281.md) | Oct 8, 2024 | | Microsoft | Windows Server 2022 (Server Core installation) | 20348.2762 | [KB5044281](https://patchblox.com/security/data/fix/microsoft/kb5044281.md) | Oct 8, 2024 | | Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1189 | [KB5044288](https://patchblox.com/security/data/fix/microsoft/kb5044288.md) | Oct 8, 2024 | | Linux | curl Debian 13.5 (trixie) | 8.9.0-1 | [DEBIAN-CVE-2024-6197](https://patchblox.com/security/data/fix/linux/debian-cve-2024-6197.md) | Jul 24, 2024 | | Linux | curl Debian 14 | 8.9.0-1 | [DEBIAN-CVE-2024-6197](https://patchblox.com/security/data/fix/linux/debian-cve-2024-6197.md) | Jul 24, 2024 | | Linux | curl Ubuntu 24.10 (oracular) | 8.9.1-2ubuntu1 | [curl 8.9.1-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-curl-8.9.1-2ubuntu1.md) | Jul 31, 2024 | | Linux | curl opensuse-leap 15.6 | 8.6.0-150600.4.3.1 | [SUSE-SU-2024:2784-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2784-1.md) | Aug 6, 2024 | | Linux | curl sles 15.6 | 8.6.0-150600.4.3.1 | [SUSE-SU-2024:2784-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-2784-1.md) | Aug 6, 2024 | | Linux | libcurl3t64-gnutls Ubuntu 24.10 (oracular) | 8.9.1-2ubuntu1 | [libcurl3t64-gnutls 8.9.1-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libcurl3t64-gnutls-8.9.1-2ubuntu1.md) | Jul 31, 2024 | | Linux | libcurl4t64 Ubuntu 24.10 (oracular) | 8.9.1-2ubuntu1 | [libcurl4t64 8.9.1-2ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libcurl4t64-8.9.1-2ubuntu1.md) | Jul 31, 2024 | --- Data as of 2026-11-08T19:12:23Z UTC. 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