CVE-2021-43396

Public Exploit

Description

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.11%

Third-Party Advisory tuxcare.com Third-Party Advisory sourceware.org Third-Party Advisory oracle.com

Affected: n/a n/a

References

Link	Tags
https://sourceware.org/bugzilla/show_bug.cgi?id=28524	issue tracking exploit third party advisory
https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d
https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396	third party advisory exploit
https://www.oracle.com/security-alerts/cpujul2022.html	third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-43396?: CVE-2021-43396 has been scored as a high severity vulnerability.
How to fix CVE-2021-43396?: To fix CVE-2021-43396, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-43396 being actively exploited in the wild?: It is possible that CVE-2021-43396 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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