CVE-2020-27783: debian debian_linux
Vulnerability summary
CVE-2020-27783 is a medium (CVSS 6.1) vulnerability in debian debian_linux. EPSS estimates a 3.98% chance of exploitation in the next 30 days, higher than 90.5% of scored vulnerabilities. 2 public exploits are recorded.
Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 5Timeline
- 03-12-2020PublishedVulnerability first disclosed.
- 17-12-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
9 scores · 7 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · PypiEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · Red hatEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
3.98%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.98% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
2 foundExploit Reference (bugzilla.redhat.com)
Maturity: unknown
Exploit Reference (advisory.checkmarx.net)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linux8.0
- software_collectionsna
- python-lxml< 0:4.2.3-2.el8
- python-lxml-debugsource< 0:4.2.3-2.el8
- python3-lxml< 0:4.2.3-2.el8
Suse3 products
- python3-lxml&distro=SUSE Linux Enterprise Module for Public Cloud 12< 3.3.5-3.12.1
- python3-lxml&distro=SUSE Linux Enterprise Server 12 SP5< 3.6.1-3.3.1
- python3-lxml&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP5< 3.6.1-3.3.1
Debian2 products
- lxml< 4.3.2-1+deb10u1 | < 4.6.2-1
- debian_linuxEOL9.0 | 10.0
Oracle2 products
Alpine1 product
- py3-lxml< 4.5.1-r1 | < 4.6.2-r0
Fedoraproject1 product
- fedoraEOL32 | 33
Lxml1 product
- lxml≥ 1.2, < 4.6.2
Mageia1 product
- python-lxml< 4.3.0-1.2.mga7
Netapp1 product
PyPI1 product
- lxml< 4.6.2 | ≥ 1.2, < 4.6.2
Ubuntu1 product
- lxml< 3.3.3-1ubuntu0.2+esm1 | < 3.5.0-1ubuntu0.2 | < 4.2.1-1ubuntu0.2 | < 4.5.0-1ubuntu0.1 | < 3.3.3-1ubuntu0.2+esm2 | < 3.5.0-1ubuntu0.3 | < 4.2.1-1ubuntu0.3 | < 4.5.0-1ubuntu0.2
11 vendors · 20 products
References
43 links- bugzilla.redhat.com/show_bug.cgi?id=1901633X Refsource MISCWEBREPORTExploitIssue TrackingPatchThird Party Advisory
www.debian.org/security/2020/dsa-4810Vendor AdvisoryX Refsource DEBIANWEBAdvisoryThird Party Advisory- lists.debian.org/debian-lts-announce/2020/12/msg00028.htmlMailing ListX Refsource MLISTWEBThird Party Advisory
