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CVE-2024-20353

A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defens

Affects Cisco ASA and Firepower Threat Defense software with a vulnerable management web server, SSL VPN, or REST API setup. CVSS rates it High.

Published
Last modified
published
Listed in CISA KEV
Actively exploited
None on Exploit-DB, Metasploit or GitHub

Summary

Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software are affected. An unauthenticated remote attacker can send a specially crafted HTTP request to the management or VPN web server, causing the device to reload unexpectedly and creating a denial of service condition.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original description

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.

Timeline

  1. Added to CISA KEV

    CISA has evidence of exploitation in the wild

  2. CVE published
  3. CISA remediation deadline

    Due date for US federal agencies to patch

  4. Record last updated
  5. EPSS reached 10%

    FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

  • Cisco Cisco Adaptive Security Appliance (ASA) Software

    9.8.1, 9.8.1.5, 9.8.1.7, 9.8.2, 9.8.2.8, 9.8.2.14, 9.8.2.15, 9.8.2.17, 9.8.2.20, 9.8.2.24, 9.8.2.26, 9.8.2.28, 9.8.2.33, 9.8.2.35, 9.8.2.38, 9.8.3.8, 9.8.3.11, 9.8.3.14, 9.8.3.16, 9.8.3.18, 9.8.3.21, 9.8.3, 9.8.3.26, 9.8.3.29, 9.8.4, 9.8.4.3, 9.8.4.7, 9.8.4.8, 9.8.4.10, 9.8.4.12, and 157 more

  • Cisco Cisco Firepower Threat Defense Software

    6.2.3, 6.2.3.1, 6.2.3.2, 6.2.3.3, 6.2.3.4, 6.2.3.5, 6.2.3.6, 6.2.3.7, 6.2.3.8, 6.2.3.10, 6.2.3.11, 6.2.3.9, 6.2.3.12, 6.2.3.13, 6.2.3.14, 6.2.3.15, 6.2.3.16, 6.2.3.17, 6.2.3.18, 6.6.0, 6.6.0.1, 6.6.1, 6.6.3, 6.6.4, 6.6.5, 6.6.5.1, 6.6.5.2, 6.6.7, 6.6.7.1, 6.4.0, and 50 more

References 1

sec.cloudapps.cisco.com

FAQ

Questions about CVE-2024-20353

What does this mean?

The bug can cause the device to reload unexpectedly, which results in a denial of service condition. The advisory describes the effect as a reload, not data theft.Source: sec.cloudapps.cisco.com

Am I affected, and how do I check?

Affected devices run Cisco ASA or FTD Software with one or more vulnerable configurations, such as the management web server, SSL VPN, or REST API enabled. To check the socket condition, run show asp table socket | include SSL; if a socket appears in the output, the device should be considered vulnerable.Source: sec.cloudapps.cisco.com

What should I do about it?

The checked facts do not name a fixed release, so the upgrade target is not confirmed here. Check the Cisco advisory for the fixed software versions for your product line.Source: sec.cloudapps.cisco.com

Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-04-24, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data

What if there's no patch?

The checked facts give no workaround. Limiting the affected feature, such as the management web server, SSL VPN, or REST API, is the only mitigation the facts point to while no fix is available.Source: sec.cloudapps.cisco.com