HIGH 7.5 Microsoft

CVE-2021-43396

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 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.

Microsoft Security Update 2021-Nov: 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 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.

Affected Products

References

Published: 2021-11-09 · Source: Microsoft · Feed updated: 2026-08-20
This high severity vulnerability with a CVSS score of 7.5 was published on 2021-11-09 via Microsoft. Affected: cbl2 glibc 2.35-1 on CBL Mariner 2.0.
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