Is CVE-2021-43818 in the CISA KEV catalog?

No. CVE-2021-43818 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43818?

CVE-2021-43818 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2021-43818?

CVE-2021-43818 has an EPSS score of 2.46% (82th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43818?

Upgrade lxml on debian 11 to 4.6.3+dfsg-0.1+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-43818

HIGHEPSS 82th pctl

8.2

CVSS v3

NVD

Description

lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available.

CWE-74Injection CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

lxmlDebian

Fixed in:4.6.3+dfsg-0.1+deb11u1CVE-2021-43818

Fixed in:4.7.1-1CVE-2021-43818

lxmlUbuntu

Fixed in:3.3.3-1ubuntu0.2+esm5USN-5225-1

Fixed in:3.5.0-1ubuntu0.4+esm2USN-5225-1

Fixed in:4.2.1-1ubuntu0.6USN-5225-1

Fixed in:4.5.0-1ubuntu0.5USN-5225-1

python-lxmlUbuntu

Fixed in:3.3.3-1ubuntu0.2+esm5USN-5225-1

Fixed in:3.5.0-1ubuntu0.4+esm2USN-5225-1

Fixed in:4.2.1-1ubuntu0.6USN-5225-1

Fixed in:4.5.0-1ubuntu0.5USN-5225-1

python3-lxmlUbuntu

Fixed in:3.3.3-1ubuntu0.2+esm5USN-5225-1

Fixed in:3.5.0-1ubuntu0.4+esm2USN-5225-1

Fixed in:4.2.1-1ubuntu0.6USN-5225-1

Fixed in:4.5.0-1ubuntu0.5USN-5225-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.46%probability of exploitation in 30 days

82ndpercentile

Elevated risk: more likely to be exploited than 82% of all known CVEs.

References

Patch5

Third-Party Advisory5

Other references4

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2251	Critical	9.8	100%	KEV	Fix
CVE-2023-22527	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-2725	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2022-35914	Critical	9.8	100%	KEV	-
CVE-2019-17558	High	7.5	99%	KEV	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 2024-11-21.