CVE-2019-10842

Name: CVE-2019-10842
Creator: NVD / NIST
Published: 2019-04-04T04:29:00.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.92%

Last modified Jun 17, 2026

CVE-2019-10842 is a vulnerability of currently unknown severity. Arbitrary code execution (via backdoor code) was discovered in bootstrap-sass 3.2.0.3, when downloaded from rubygems.org. An unauthenticated attacker can craft the ___cfduid cookie value with base64 arbitrary code to be executed via eval(), which can be leveraged to execute arbitrary code on the target system. EPSS estimates a 4.92% chance of exploitation in the next 30 days.

Description

Arbitrary code execution (via backdoor code) was discovered in bootstrap-sass 3.2.0.3, when downloaded from rubygems.org. An unauthenticated attacker can craft the ___cfduid cookie value with base64 arbitrary code to be executed via eval(), which can be leveraged to execute arbitrary code on the target system. Note that there are three underscore characters in the cookie name. This is unrelated to the __cfduid cookie that is legitimately used by Cloudflare.

Metrics

EPSS Probability

4.92%

91.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Getbootstrap	Bootstrap-Sass	3.2.0.3

References

http://dgb.github.io/2019/04/05/bootstrap-sass-backdoor.htmlThird Party Advisory
https://github.com/twbs/bootstrap-sass/issues/1195Issue Tracking, Third Party Advisory
https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem/Exploit, Third Party Advisory
https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093Exploit, Third Party Advisory
http://dgb.github.io/2019/04/05/bootstrap-sass-backdoor.htmlThird Party Advisory
https://github.com/twbs/bootstrap-sass/issues/1195Issue Tracking, Third Party Advisory
https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem/Exploit, Third Party Advisory
https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093Exploit, Third Party Advisory

Timeline

Published: Apr 4, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-10842?

How severe is CVE-2019-10842?

Severity scoring for CVE-2019-10842 is pending analysis. The EPSS model estimates a 4.92% probability of exploitation in the next 30 days.

How do I fix CVE-2019-10842?

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-2019-10842?

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

Scan your code now

Source: NVD / NIST