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CVE-2024-20353

Cisco — Cisco ASA and FTD Denial of Service Vulnerability

Cisco · CWE-835 · in CISA KEV since 2024-04-24

KEV since 2024 · listed over a yearCISA KEVActively Exploited
78

EVRS 78 of 100 Urgent

Patch This Cycle

Rank 640 of 2,960 tracked

Download PDF

Why it scores 78

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.707.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

No fixed version identified yet

CISA required action

Affected versions

  • secure firewall threat defense6.2.36.2.3.16.2.3.26.2.3.36.2.3.46.2.3.56.2.3.66.2.3.76.2.3.86.2.3.96.2.3.106.2.3.116.2.3.126.2.3.136.2.3.146.2.3.156.2.3.166.2.3.176.2.3.186.4.06.4.0.16.4.0.26.4.0.36.4.0.46.4.0.56.4.0.66.4.0.76.4.0.86.4.0.96.4.0.106.4.0.116.4.0.126.4.0.136.4.0.146.4.0.156.4.0.166.4.0.176.6.06.6.0.16.6.16.6.36.6.46.6.56.6.5.16.6.5.26.6.76.6.7.16.7.06.7.0.16.7.0.26.7.0.37.0.07.0.0.17.0.17.0.1.17.0.27.0.2.17.0.37.0.47.0.57.0.67.0.6.17.1.07.1.0.17.1.0.27.1.0.37.2.07.2.0.17.2.17.2.27.2.37.2.47.2.4.17.2.57.2.5.17.3.07.3.17.3.1.17.4.07.4.1
  • adaptive security appliance software9.8.19.8.1.59.8.1.79.8.29.8.2.89.8.2.149.8.2.159.8.2.179.8.2.209.8.2.249.8.2.269.8.2.289.8.2.339.8.2.359.8.2.389.8.39.8.3.89.8.3.119.8.3.149.8.3.169.8.3.189.8.3.219.8.3.269.8.3.299.8.49.8.4.39.8.4.79.8.4.89.8.4.109.8.4.129.8.4.159.8.4.179.8.4.209.8.4.229.8.4.259.8.4.269.8.4.299.8.4.329.8.4.339.8.4.349.8.4.359.8.4.399.8.4.409.8.4.419.8.4.439.8.4.449.8.4.459.8.4.469.8.4.489.12.19.12.1.29.12.1.39.12.29.12.2.19.12.2.49.12.2.59.12.2.99.12.39.12.3.29.12.3.79.12.3.99.12.3.129.12.49.12.4.29.12.4.49.12.4.79.12.4.89.12.4.109.12.4.139.12.4.189.12.4.249.12.4.269.12.4.299.12.4.309.12.4.359.12.4.379.12.4.389.12.4.399.12.4.409.12.4.419.12.4.479.12.4.489.12.4.509.12.4.529.12.4.549.12.4.559.12.4.569.12.4.589.12.4.629.12.4.659.14.19.14.1.69.14.1.109.14.1.159.14.1.199.14.1.309.14.29.14.2.49.14.2.89.14.2.139.14.2.159.14.39.14.3.19.14.3.99.14.3.119.14.3.139.14.3.159.14.3.189.14.49.14.4.69.14.4.79.14.4.129.14.4.139.14.4.149.14.4.159.14.4.179.14.4.229.14.4.239.15.19.15.1.19.15.1.79.15.1.109.15.1.159.15.1.169.15.1.179.15.1.219.16.19.16.1.289.16.29.16.2.39.16.2.79.16.2.119.16.2.139.16.2.149.16.39.16.3.39.16.3.149.16.3.159.16.3.199.16.3.239.16.49.16.4.99.16.4.149.16.4.189.16.4.199.16.4.279.16.4.389.16.4.399.16.4.429.16.4.489.16.4.559.17.19.17.1.79.17.1.99.17.1.109.17.1.119.17.1.139.17.1.159.17.1.209.17.1.309.17.1.339.18.19.18.1.39.18.29.18.2.59.18.2.79.18.2.89.18.39.18.3.399.18.3.469.18.3.539.18.3.559.18.3.569.18.49.18.4.59.18.4.89.19.19.19.1.59.19.1.99.19.1.129.19.1.189.19.1.229.19.1.249.19.1.279.20.19.20.1.59.20.2

Remediation

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 8.6 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.707 (99.4th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2024-05-01 · KEV since 2024 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 8.6 (v3.1), assigned by cisco. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do