IOC Radar
CVEHighVerifiedSignal 59/100EPSS 8.8%

CVE-2025-53521

First Seen
Jun 2, 2026
Last Seen
Jun 3, 2026
Jun 2
First Seen
3d ago
Jun 3
Last Seen
2d ago
3
Reports
source reports
75%
Confidence
high
Found in 3 reports. Confidence: high. · Confidence scores are heuristic. Verify before acting on results.
CVE
Known vulnerability being actively exploited in the wild.
MISP Category
vulnerability
EPSS Score
8.77%
EPSS Percentile
92.7th
Confidence
75%
Signal Score
59 / 100
IDS Rule
No
CVE Intelligence
Exploit Probability8.77%
92.7th percentile of all CVEs
Threat Context
Malware Families1
CCertify
Tags

Feed Intelligence Summary

3 reports75% confidence
NS
NSFOCUS Security Labs
May 28, 2026
NSFOCUS Monthly APT Insights – March 2026
1 IOC in report
RF
Recorded Future Blog
Apr 13, 2026
March 2026 CVE Landscape: 31 High-Impact Vulnerabilities Identified, Interlock Ransomware Group Exploits Cisco FMC Zero-Day
35 IOCs in report
RF
Recorded Future Blog
Apr 13, 2026
March 2026 CVE Landscape: 31 High-Impact Vulnerabilities Identified, Interlock Ransomware Group Exploits Cisco FMC Zero-Day
35 IOCs in report

Activity Timeline

3 total obs
May 28Apr 13

Threat Activity Heatmap

· Peak: 2026-04-13
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24h
0
Dormant
7d
0
Dormant
30d
1
Minimal
3mo
3
Moderate
Threat ScoreMedium Risk
59
SIGNAL
Signal Score
75%
Confidence
3
Reports
First seenJun 2, 2026
Last seenJun 3, 2026
Verified IOC

VirusTotal

Not checked

Export & API

STIX 2.1 Bundle
CSV Export
Permalink

IOC Journey

high
First detected 3 days ago · Last seen 2 days ago
Appeared in 3 threat reports from 3 sources
Associated with: UNC1069, MuddyWater, APT28
Used by malware: Certify