CVE-2017-5421: mozilla firefox Improper Input Validation
CVSS: 7.5v3.0HighModified
AliasesUBUNTU-CVE-2017-5421
Published 11-06-2018Last modified 05-08-2024
Vulnerability summary
CVE-2017-5421 is a high (CVSS 7.5) Improper Input Validation vulnerability in mozilla firefox. EPSS estimates a 1.88% chance of exploitation in the next 30 days, higher than 79.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.0 (NVD)EPSS score
1.88%
0%100%
Low · -0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 6 · Related 5Timeline
- 11-06-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
A malicious site could spoof the contents of the print preview window if popup windows are enabled, resulting in user confusion of what site is currently loaded. This vulnerability affects Firefox < 52 and Thunderbird < 52.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.5Preferred score · NVD (NIST)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.88%
Chance of exploitation in the next 30 days
Percentile
79%
Versus all other CVEs
30-day change
-0.04 pp
From 1.92% on 18-09-2026
18-09-202618-10-2026
EPSS score1.88%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.mozilla.org)
Maturity: unknown
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
References
9 links- bugzilla.mozilla.org/show_bug.cgi?id=1301876X Refsource CONFIRMExploitIssue TrackingPatchVendor Advisory