Cisco ASA and FTD Web Services Denial of Service Vulnerability
CVE-2024-20353 is a denial-of-service vulnerability in the management and VPN web servers of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software. The flaw is caused by incomplete error checking while parsing an HTTP header. An unauthenticated remote attacker can trigger the issue by sending a crafted HTTP request to a targeted management or VPN web interface. Successful exploitation causes the affected device to reload unexpectedly, producing a denial-of-service condition. Cisco and multiple reporting sources also associate this CVE with the ArcaneDoor intrusion activity, where attackers reportedly used the forced reboot behavior to facilitate deployment of additional malware components on compromised devices.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Cisco ASA zero-day vulnerability referenced as part of the 2024 ArcaneDoor campaign and used to deploy malware on targeted devices.
A critical unauthenticated remote code execution vulnerability in the Spam Quarantine web interface of Cisco Secure Email Gateway (ESA) and Secure Email and Web Manager (SMA) appliances, caused by insufficient validation of user-supplied HTTP requests, enabling arbitrary command execution as root.
A zero-day vulnerability in Cisco devices exploited as part of the ArcaneDoor campaign to breach government networks.
CVE-2024-20353 is a vulnerability referenced in the context of a new espionage-focused campaign targeting perimeter network devices, as reported by Talos Intelligence and Cisco. It is significant due to its exploitation in targeted attacks against network infrastructure.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.