CVE-2020-27783

Name: CVE-2020-27783
Creator: NVD / NIST
Published: 2020-12-03T17:15:13.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 3.93%

Last modified Jun 17, 2026

CVE-2020-27783 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 3.93% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

3.93%

89.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Lxml	Lxml	>= 1.2, < 4.6.2
Redhat	Software Collections	All versions
Redhat	Enterprise Linux	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Netapp	Snapcenter	All versions
Oracle	Communications Offline Mediation Controller	12.0.0.3.0
Oracle	Zfs Storage Appliance Kit	8.8

References

https://advisory.checkmarx.net/advisory/CX-2020-4286Exploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1901633Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00028.htmlMailing 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-4810Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
https://advisory.checkmarx.net/advisory/CX-2020-4286Exploit, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1901633Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00028.htmlMailing 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-4810Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory

Timeline

Published: Dec 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27783?

How severe is CVE-2020-27783?

CVE-2020-27783 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 3.93% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27783?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27783?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST