HomeVulnerabilitiesCVE-2024-20353
Active Exploitation

CVE-2024-20353

A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

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Confirmed Active Exploitation

This vulnerability is listed in the CISA KEV Catalog. Federal agencies are mandated to patch immediately. Immediate remediation is required.

Exploitation Probability (EPSS)

Medium Priority
24.45%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

4 events
Apr 24, 2024
Vulnerability Disclosed
Published to component-level vulnerability database.
Jun 11, 2025
EPSS Score Decreased
Daily EPSS score decreased by 0.453 on 2024-04-26
Oct 28, 2025
Last Updated
Record updated with new analysis or tags.
Nov 19, 2025
EPSS Score Increased
Daily EPSS score increased by 0.539 on 2024-04-26

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

100 Total
cisco/adaptive_security_appliance_software9.8.1
cisco/adaptive_security_appliance_software9.8.1.5
cisco/adaptive_security_appliance_software9.8.1.7
cisco/adaptive_security_appliance_software9.8.2
cisco/adaptive_security_appliance_software9.8.2.8

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Vulnerability Details

CVSS Base Score
8.6/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Published Date
Apr 24, 2024
Last Modified
Oct 28, 2025
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