{"id":"CVE-2021-43396","title":"In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset","summary":"In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","vendor":"gnu","product":"glibc","affected":["glibc = 2.34","communications_cloud_native_core_binding_support_function = 22.1.3","communications_cloud_native_core_network_function_cloud_native_environment = 22.1.0","communications_cloud_native_core_network_repository_function = 22.1.2","communications_cloud_native_core_network_repository_function = 22.2.0","communications_cloud_native_core_security_edge_protection_proxy = 22.1.1","communications_cloud_native_core_unified_data_repository = 22.2.0","enterprise_operations_monitor = 4.3","enterprise_operations_monitor = 4.4","enterprise_operations_monitor = 5.0"],"published":"2021-11-04","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:16.160","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-43396","references":[{"url":"https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396","label":"cve@mitre.org"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=28524","label":"cve@mitre.org"},{"url":"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"cve@mitre.org"},{"url":"https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=28524","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.03293,"epssPercentile":0.88215,"ingestedAt":"2026-10-14T12:29:10.827Z","slug":"CVE-2021-43396","body":"## Overview\n\nIn iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases. NOTE: the vendor states \"the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there's no security impact to the bug.\n\n## Affected\n\n- `glibc = 2.34`\n- `communications_cloud_native_core_binding_support_function = 22.1.3`\n- `communications_cloud_native_core_network_function_cloud_native_environment = 22.1.0`\n- `communications_cloud_native_core_network_repository_function = 22.1.2`\n- `communications_cloud_native_core_network_repository_function = 22.2.0`\n- `communications_cloud_native_core_security_edge_protection_proxy = 22.1.1`\n- `communications_cloud_native_core_unified_data_repository = 22.2.0`\n- `enterprise_operations_monitor = 4.3`\n- `enterprise_operations_monitor = 4.4`\n- `enterprise_operations_monitor = 5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.7,"exploitation":0,"ransomware":0},"changes":[]}