No exploitation reportedFix available

CVE-2021-44420

Q: Is CVE-2021-44420 actively exploited?

Active exploitation of CVE-2021-44420 has not been confirmed. Its EPSS score was 2.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-44420?

CVE-2021-44420 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

No exploitation reported by the sources we read.

Published2021-12-08

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Django 2.2 before 2.2.25, 3.1 before 3.1.14, and 3.2 before 3.2.10, HTTP requests for URLs with trailing newlines could bypass upstream access control based on URL paths.

Timeline

dates in UTC

2021-12-0800:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-44420?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-44420?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
20.4	= 20.04	no fix published	NVD
21.4	= 21.04	no fix published	NVD
21.10	= 21.10	no fix published	NVD

Django

Branch	Affected	Fixed in	Source
3.2	≥ 3.2, < 3.2.10	3.2.10	NVD
3.1	≥ 3.1, < 3.1.14	3.1.14	NVD
2.2	≥ 2.2, < 2.2.25	2.2.25	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD
11.0	= 11.0	no fix published	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

docs.djangoproject.comPatch · Vendor Advisory
www.djangoproject.comPatch · Vendor Advisory
www.openwall.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.3read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
FIRST EPSSEPSS score2.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: 2021-12-08
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-44420?

In Django 2.2 before 2.2.25, 3.1 before 3.1.14, and 3.2 before 3.2.10, HTTP requests for URLs with trailing newlines could bypass upstream access control based on URL paths.

Is CVE-2021-44420 actively exploited?

Active exploitation of CVE-2021-44420 has not been confirmed. Its EPSS score was 2.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-44420?

CVE-2021-44420 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

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