Is CVE-2021-43396 in the CISA KEV catalog?

No. CVE-2021-43396 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43396?

CVE-2021-43396 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-43396?

CVE-2021-43396 has an EPSS score of 2.94% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43396?

Upgrade glibc on debian 11 to 2.31-13+deb11u3 or later.

CVE & CISA-KEV Catalog

CVE-2021-43396

HIGHEPSS 85th pctl

7.5

CVSS v3

NVD

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.

How to fix

Remediation Available

glibcDebian

Fixed in:2.31-13+deb11u3CVE-2021-43396

Fixed in:2.32-5CVE-2021-43396

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

2.94%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Patch1

oracle.com

Exploit2

Other references1

sourceware.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.