Critical Alert 4 Active Exploits Detected Today

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CVE-2026-94127 — F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability →
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CVE-2026-85102 — Check Point Multiple Products Improper Certificate Validation Vulnerability →
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September 23, 2026

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CVE-2026-20154NVD

Vulnerability Summary

A vulnerability in the system rate-limiting process for syslog message 419002 of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause high CPU utilization on an affected device, resulting in a denial of service (DoS) condition.

This vulnerability is due to improper rate limiting for syslog message 419002. An attacker could exploit this vulnerability by sending a flood of TCP synchronization (SYN) packets to an affected device. A successful exploit could allow the attacker to cause high CPU utilization, resulting in performance degradation. 
Severity Level
HIGH(8.6)
Published Date
Sep 16, 2026
Last Modified
Sep 18, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.40%Probability
Root Weakness (CWE)
CWE-835: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 8.6 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.1
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.1.28
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.2
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.2.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.2.7
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.2.11
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.2.13
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.2.14
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.3.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.3.14
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.1
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.3.15
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.1.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.2
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.3.19
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.3.23
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.2.5
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.2.7
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.9
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.2.8
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.14
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.5
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.18
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.9
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.3.39
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.19
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.12
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.3.46
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.27
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.18
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.3.53
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.3.55
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.38
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.39
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.3.56
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.1
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.42
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.22
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.1.5
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.5
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.24
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.48
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.8
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.2
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.27
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.55
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.22
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.2.10
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.57
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.28
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.24
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.2.21
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.61
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.31
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.29
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.2.22
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.62
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.34
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.67
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.70
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.40
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.23.1
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.1.1
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.71
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.4
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.47
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.7
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.37
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.76
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.9
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.38
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.50
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.1.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.10
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.1.2
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.52
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.13
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.1.6
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.53
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.82
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.2
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.16
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.19.1.42
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.57
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.84
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.23.1.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.3.20
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.2.4
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.23.1.7
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.4
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.2.9
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.23.1.13
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.4.7
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.2.13
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.66
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.4.10
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.23.1.19
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.16.4.85
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.2.14
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.67
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.18.4.68
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.23.1.22
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.20.4.14
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software >= 9.22.2.20
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.0
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.0.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.1.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.0
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.2.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.3
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.0.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.4
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.5
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.3.0
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.3
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.3.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.4
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.6
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.5
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.4.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.3.1.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.0
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.6.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.5.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.6
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.6.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.1.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.7
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.5.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.3.1.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.8
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.6.0
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.8.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.6.3
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.2.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.9
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.7
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.7.0
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.2.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.10
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.6.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.2.3
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.8
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.6.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.7.10
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.7.11
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.0.8.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.6.2.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.7.10.1
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.2.4
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.2.10.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.3
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.6.4
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software >= 7.4.4
Patched Versions
Not provided by cveorg for this CVE.
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📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
⚙️Custom EPSS — Filter noise, focus on risk.
💬Webhooks — Slack & Teams integration.
🚫Ad-Free — Uninterrupted experience.

External References