Is CVE-2022-40304 in the CISA KEV catalog?

No. CVE-2022-40304 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-40304?

CVE-2022-40304 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2022-40304?

CVE-2022-40304 has an EPSS score of 6.78% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-40304?

Upgrade libxml2 on debian 11 to 2.9.10+dfsg-6.7+deb11u3 or later. Fixes are available for 15 affected products.

CVE & CISA-KEV Catalog

CVE-2022-40304

HIGHEPSS 93th pctl

7.8

CVSS v3

NVD

Description

An issue was discovered in libxml2 before 2.10.3. Certain invalid XML entity definitions can corrupt a hash table key, potentially leading to subsequent logic errors. In one case, a double-free can be provoked.

CWE-415

How to fix

Remediation Available

libxml2Debian

Fixed in:2.9.10+dfsg-6.7+deb11u3CVE-2022-40304

Fixed in:2.9.14+dfsg-1.1CVE-2022-40304

libxml2Red Hat / RHEL

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2Rocky

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2-debuginfoRed Hat / RHEL

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2-debuginfoRocky

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2-debugsourceRocky

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2-debugsourceRed Hat / RHEL

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2-develRed Hat / RHEL

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2-develRocky

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

python3-libxml2Rocky

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

python3-libxml2Red Hat / RHEL

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

python3-libxml2-debuginfoRocky

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

python3-libxml2-debuginfoRed Hat / RHEL

Fixed in:0:2.9.7-13.el8_6.4RHSA-2024:0413

libxml2Ubuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.13+esm4USN-5760-2

Fixed in:2.9.3+dfsg1-1ubuntu0.7+esm4USN-5760-2

Fixed in:2.9.4+dfsg1-6.1ubuntu1.8USN-5760-1

Fixed in:2.9.10+dfsg-5ubuntu0.20.04.5USN-5760-1

Fixed in:2.9.13+dfsg-1ubuntu0.2USN-5760-1

Fixed in:2.9.14+dfsg-1ubuntu0.1USN-5760-1

libxml2-utilsUbuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.13+esm4USN-5760-2

Fixed in:2.9.3+dfsg1-1ubuntu0.7+esm4USN-5760-2

Fixed in:2.9.4+dfsg1-6.1ubuntu1.8USN-5760-1

Fixed in:2.9.10+dfsg-5ubuntu0.20.04.5USN-5760-1

Fixed in:2.9.13+dfsg-1ubuntu0.2USN-5760-1

Fixed in:2.9.14+dfsg-1ubuntu0.1USN-5760-1

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

6.78%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Patch2

Third-Party Advisory11

Other references1

seclists.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 2025-04-28.