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Vulnerability details: VCID-6m1t-sn26-fbaf
Vulnerability ID VCID-6m1t-sn26-fbaf
Aliases CVE-2017-5403
Summary When adding a range to an object in the DOM, it is possible to use addRange to add the range to an incorrect root object. This triggers a use-after-free, resulting in a potentially exploitable crash.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
epss 0.00516 https://api.first.org/data/v1/epss?cve=CVE-2017-5403
cvssv2 6.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2017-5403
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2017-5403
archlinux Critical https://security.archlinux.org/AVG-194
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-05
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-09
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2017-5403
https://bugzilla.mozilla.org/show_bug.cgi?id=1340186
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2017-05/
https://www.mozilla.org/security/advisories/mfsa2017-09/
http://www.securityfocus.com/bid/96691
http://www.securitytracker.com/id/1037966
ASA-201703-3 https://security.archlinux.org/ASA-201703-3
AVG-194 https://security.archlinux.org/AVG-194
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2017-5403 https://nvd.nist.gov/vuln/detail/CVE-2017-5403
mfsa2017-05 https://www.mozilla.org/en-US/security/advisories/mfsa2017-05
mfsa2017-09 https://www.mozilla.org/en-US/security/advisories/mfsa2017-09
USN-3216-1 https://usn.ubuntu.com/3216-1/
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2017-5403
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-2017-5403
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 0.66592
EPSS Score 0.00516
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:16:41.364213+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2017/mfsa2017-05.yml 38.0.0