Strix
26.1K

CVE-2021-23435

MEDIUMCVSS 6.1/10EPSS 0.68%

Last modified

CVE-2021-23435 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

Description

This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).

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
0.68%

47.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ThoughtbotClearance< 2.5.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-23435?
This affects the package clearance before 2.5.0. The vulnerability can be possible when users are able to set the value of session[:return_to]. If the value used for return_to contains multiple leading slashes (/////example.com) the user ends up being redirected to the external domain that comes after the slashes (http://example.com).
How severe is CVE-2021-23435?
CVE-2021-23435 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23435?
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-2021-23435?

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

Scan your code now

Source: NVD / NIST