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Vulnerability details: VCID-2734-b497-nqct
Vulnerability ID VCID-2734-b497-nqct
Aliases CVE-2019-10842
GHSA-vqqv-v9m2-48p2
Summary Bootstrap-sass contains code execution backdoor 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.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-10842.json
epss 0.14282 https://api.first.org/data/v1/epss?cve=CVE-2019-10842
epss 0.14282 https://api.first.org/data/v1/epss?cve=CVE-2019-10842
cvssv3 9.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-vqqv-v9m2-48p2
cvssv3.1 9.8 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bootstrap-sass/CVE-2019-10842.yml
generic_textual CRITICAL https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bootstrap-sass/CVE-2019-10842.yml
cvssv3.1 9.8 https://github.com/twbs/bootstrap-sass
generic_textual CRITICAL https://github.com/twbs/bootstrap-sass
cvssv3 9.8 https://github.com/twbs/bootstrap-sass/issues/1195
cvssv3.1 9.8 https://github.com/twbs/bootstrap-sass/issues/1195
generic_textual CRITICAL https://github.com/twbs/bootstrap-sass/issues/1195
cvssv2 10.0 https://nvd.nist.gov/vuln/detail/CVE-2019-10842
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-10842
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-10842
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2019-10842
cvssv3.1 9.8 https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem
generic_textual CRITICAL https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem
cvssv3.1 9.8 https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
generic_textual CRITICAL https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
Reference id Reference type URL
http://dgb.github.io/2019/04/05/bootstrap-sass-backdoor.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-10842.json
https://api.first.org/data/v1/epss?cve=CVE-2019-10842
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bootstrap-sass/CVE-2019-10842.yml
https://github.com/twbs/bootstrap-sass
https://github.com/twbs/bootstrap-sass/issues/1195
https://nvd.nist.gov/vuln/detail/CVE-2019-10842
https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem
https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem/
https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
1697482 https://bugzilla.redhat.com/show_bug.cgi?id=1697482
cpe:2.3:a:getbootstrap:bootstrap-sass:3.2.0.3:*:*:*:*:ruby:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:getbootstrap:bootstrap-sass:3.2.0.3:*:*:*:*:ruby:*:*
GHSA-vqqv-v9m2-48p2 https://github.com/advisories/GHSA-vqqv-v9m2-48p2
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-10842.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bootstrap-sass/CVE-2019-10842.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/twbs/bootstrap-sass
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/twbs/bootstrap-sass/issues/1195
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2019-10842
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-10842
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-10842
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://snyk.io/blog/malicious-remote-code-execution-backdoor-discovered-in-the-popular-bootstrap-sass-ruby-gem
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://snyk.io/vuln/SNYK-RUBY-BOOTSTRAPSASS-174093
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.94051
EPSS Score 0.14282
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:21:42.265744+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2019/04/GHSA-vqqv-v9m2-48p2/GHSA-vqqv-v9m2-48p2.json 36.1.3