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CVE-2020-27783 lxml

Affected softwarelxml
Severity6.1 Medium CVSS 3.1 3 scores
WeaknessCross-site scripting (CWE-79)
Published3 Dec 2020
Updated17 Jun 2026

Description

A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 4.0% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

6.1 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N NVD Primary published
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CISA-ADP Secondary
CVSS 2.0 4.3 none AV:N/AC:M/Au:N/C:N/I:P/A:N NVD Primary

Affected software and releases

Products and versions

8 products, 10 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 9.0 · 10.0
nvd fedoraproject fedora generic 32 · 33
nvd lxml lxml generic ≥ 1.2 and < 4.6.2
nvd netapp snapcenter generic any version
nvd oracle communications offline mediation controller generic 12.0.0.3.0
nvd oracle zfs storage appliance kit generic 8.8
nvd redhat enterprise linux generic 8.0
nvd redhat software collections generic any version

References

URLTags
https://advisory.checkmarx.net/advisory/CX-2020-4286 Exploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1901633 Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00028.html Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/
https://security.netapp.com/advisory/ntap-20210521-0003/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4810 Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory

Timeline

Published2020-12-03By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.