Known exploited vulnerability
CVE-2024-20353
The short answer
CVE-2024-20353 affects Cisco Cisco Adaptive Security Appliance (ASA) Software and is rated high (CVSS 8.6). CISA added it to the Known Exploited Vulnerabilities catalog on 2024-04-24: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-835.
Severity
8.6 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploited (CISA KEV)
Yes, since Apr 24, 2024
Federal due date May 1, 2024
EPSS, next 30 days
70%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected products
Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense Software, asa, firepower_threat_defense_software. NVD's record lists the exact affected versions.
References
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2 Vendor Advisory
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-websrvs-dos-X8gNucD2 Vendor Advisory
- blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/ ExploitThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-20353 US Government Resource
Questions
Is CVE-2024-20353 being exploited?
Yes. CISA added CVE-2024-20353 to its Known Exploited Vulnerabilities catalog on 2024-04-24, with a federal remediation due date of 2024-05-01.
How do I fix CVE-2024-20353?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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