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Vulnerabilities

Vulnerability · 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…

Published Nov 4, 2021 · catalog updated Oct 14, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2021-43396. EPSS is 3.29%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.29%
Remediation
Advisory link
Affected products
cpe gnu/glibc · cpe oracle/communications cloud native core binding support function · cpe oracle/communications cloud native core network function cloud native environment · cpe oracle/communications cloud native core network repository function · cpe oracle/communications cloud native core security edge protection proxy · cpe oracle/communications cloud native core unified data repository

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe gnu/glibc2.34
  • cpe oracle/communications cloud native core binding support function22.1.3
  • cpe oracle/communications cloud native core network function cloud native environment22.1.0
  • cpe oracle/communications cloud native core network repository function22.1.2
  • cpe oracle/communications cloud native core network repository function22.2.0
  • cpe oracle/communications cloud native core security edge protection proxy22.1.1
  • cpe oracle/communications cloud native core unified data repository22.2.0
  • cpe oracle/enterprise operations monitor4.3

How to fix CVE-2021-43396

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-43396. EPSS is 3.29%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with oracle/communications cloud native core binding support function 22.1.3; oracle/communications cloud native core network function cloud native environment 22.1.0; oracle/communications cloud native core network repository function 22.1.2; oracle/communications cloud native core network repository function 22.2.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 3.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 4, 2021 · NIST NVD

    Detected

    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, w

  2. Oct 14, 2026 · NIST NVD

    Updated

    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, w

Sources

  • CVE.orgVulnerability recordCVE-2021-43396

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-43396

    30-day exploitation probability 3.29%

    first.org
  • NIST NVDVulnerability recordCVE-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. NOT

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.