Client-side request smuggling in Cisco Secure Firewall ASA/FTD VPN web services
A vulnerability in the VPN web services component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software allows an unauthenticated remote attacker to conduct browser-based attacks against users of an affected device. The issue is caused by improper validation of HTTP requests in VPN web services endpoints that support VPN features. An attacker can entice a victim to visit a malicious website that causes the victim’s browser to send crafted HTTP requests to the affected ASA/FTD web services endpoint; the device then reflects attacker-controlled input back to the victim’s browser, enabling browser-based attacks such as cross-site scripting (XSS). The attacker cannot directly impact the affected device itself.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.