CVE-2017-5403: mozilla firefox Use After Free
CVSS: 9.8v3.0CriticalModified
AliasesUBUNTU-CVE-2017-5403
Published 11-06-2018Last modified 05-08-2024
Vulnerability summary
CVE-2017-5403 is a critical (CVSS 9.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 1.66% chance of exploitation in the next 30 days, higher than 76.3% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.0 (NVD)EPSS score
1.66%
0%100%
Low · -0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 6 · Related 5Timeline
- 11-06-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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. This vulnerability affects Firefox < 52 and Thunderbird < 52.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.66%
Chance of exploitation in the next 30 days
Percentile
76%
Versus all other CVEs
30-day change
-0.04 pp
From 1.70% on 18-09-2026
18-09-202618-10-2026
EPSS score1.66%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mozilla2 products
- firefox≥ unspecified, < 52 | < 52.0
- thunderbird≥ unspecified, < 52 | < 52.0
Ubuntu1 product
- firefox< 52.0+build2-0ubuntu0.14.04.1 | < 52.0+build2-0ubuntu0.16.04.1
2 vendors · 3 products