What is CVE-2021-42053?

CVE-2021-42053 is a medium-severity vulnerability in Django-Unicorn Unicorn, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-10-07.

How severe is CVE-2021-42053?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Django-Unicorn Unicorn

CVE-2021-42053

The Unicorn framework through 0.35.3 for Django allows XSS via component.name.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-10-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.025 (84.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Django-Unicorn Unicorn

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/adamghill/django-unicorn/pull/288/files (Patch, Third Party Advisory)
packetstormsecurity.com/files/164442/django-unicorn-0.35.3-Cross-Site-Scripting… (Exploit, Third Party Advisory)
github.com/adamghill/django-unicorn/compare/0.35.3...0.36.0 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42053?: CVE-2021-42053 is a medium-severity vulnerability in Django-Unicorn Unicorn, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-10-07.
How severe is CVE-2021-42053?: Medium severity. CVSS v3 base score is 5.4 out of 10.