Python
CVE-2021-43818
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
1Blast Radius
ecosystem impact- 90 pypi packages depend on lxml (85 direct, 5 indirect)
Ecosystem-wide dependent count for version 4.6.5.
DescriptionNVD
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.
AnalysisAI
lxml is a library for processing XML and HTML in the Python language. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
Technical ContextAI
This vulnerability is classified under CWE-74. 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. Affected products include: Lxml, Fedoraproject Fedora, Debian Debian Linux, Netapp Solidfire, Netapp Solidfire Enterprise Sds. Version information: version 4.6.5.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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External POC / Exploit Code
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