EPSS Score
Source: FIRST.org · 2026-05-24
0.37%
probability
This CVE has a 0.37% probability
of being exploited in the next 30 days.
0%
Top 59.0th percentile of all CVEs
100%
CVSS score unavailable
Neither CIRCL nor NVD returned a CVSS score for this CVE.
View on VulnerabilityLookup ↗
Affected Products
It Took Mozilla 22 Hours to Patch a Firefox Vulnerability Discovered at Pwn2Own
BleepingComputer
Mar 20, 2017
Signal Intelligence
Confidence
75%
EPSS
0.37%
Mentions
1
Last Seen
Mar 20, 2017
CNA Information
Analyst Note
CVE-2017-5428 was exploited at Pwn2Own (a live hacking competition where zero-days are demonstrated against unpatched systems), and Mozilla patched it within 22 hours of discovery. This aligns with zero-day criteria: exploitation occurred before patch availability, with an extremely tight patch timeline characteristic of zero-day responses.
Triage Info
Decided atMar 20, 2026