CVE-2021-31402

Name: CVE-2021-31402
Creator: NVD / NIST
Published: 2021-04-15T19:15:12.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.16%

Last modified Jun 17, 2026

CVE-2021-31402 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669.. EPSS estimates a 1.16% chance of exploitation in the next 30 days.

Description

The dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.16%

63.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Flutterchina	Dio	>= 4.0.0, < 5.0.0

References

https://github.com/flutterchina/dio/issues/1130Exploit, Issue Tracking, Third Party Advisory
https://github.com/flutterchina/dio/issues/1130Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Apr 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31402?

The dio package 4.0.0 for Dart allows CRLF injection if the attacker controls the HTTP method string, a different vulnerability than CVE-2020-35669.

How severe is CVE-2021-31402?

CVE-2021-31402 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.16% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31402?

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-2021-31402?

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

Scan your code now

Source: NVD / NIST