Is CVE-2022-4121 in the CISA KEV catalog?

No. CVE-2022-4121 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-4121?

CVE-2022-4121 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2022-4121?

CVE-2022-4121 has an EPSS score of 0.54% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-4121?

Upgrade libetpan on debian 11 to 1.9.4-3+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2022-4121

MEDIUM

5.5

CVSS v3

NVD

Description

In libetpan a null pointer dereference in mailimap_mailbox_data_status_free in low-level/imap/mailimap_types.c was found that could lead to a remote denial of service or other potential consequences.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

libetpanDebian

Fixed in:1.9.4-3+deb11u1CVE-2022-4121

Fixed in:1.9.4-3.1CVE-2022-4121

libetpanUbuntu

Fixed in:1.6-1ubuntu0.1+esm1USN-7740-1

Fixed in:1.8.0-1ubuntu0.1~esm1USN-7740-1

Fixed in:1.9.4-2ubuntu0.1~esm1USN-7740-1

Fixed in:1.9.4-3+deb11u1build0.22.04.1USN-7740-1

libetpan17Ubuntu

Fixed in:1.6-1ubuntu0.1+esm1USN-7740-1

libetpan20Ubuntu

Fixed in:1.8.0-1ubuntu0.1~esm1USN-7740-1

Fixed in:1.9.4-2ubuntu0.1~esm1USN-7740-1

Fixed in:1.9.4-3+deb11u1build0.22.04.1USN-7740-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.54%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Patch2

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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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 2025-11-03.