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CVE-2020-3580 is a set of cross-site scripting vulnerabilities in the web services interface of Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software. Insufficient validation of user-supplied input in affected AnyConnect and WebVPN configurations permits attacker-controlled script to be incorporated into interface content. An unauthenticated remote attacker can exploit the issue by convincing an interface user to follow a crafted link.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single HTML file ('xss.html') that demonstrates a proof-of-concept (POC) exploit for a cross-site scripting (XSS) vulnerability in a SAML endpoint, likely targeting Cisco web applications. The file constructs a form that submits a crafted SAMLResponse parameter containing an XSS payload ('"><svg/onload=alert('XSS')>') to the endpoint 'https://domain/+CSCOE+/saml/sp/acs?tgname=a'. The form is automatically submitted via JavaScript, simulating an attack scenario where a vulnerable server would process the malicious SAMLResponse and execute the injected JavaScript. The exploit is a POC and does not include advanced payloads or automation, but clearly demonstrates the vulnerability and its impact.
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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An observed vulnerability chain in a firewall product where improper input validation leads to XSS; the content explicitly says it was exploited in the wild.
A vulnerability chain in a firewall product where improper input validation leads to XSS; the content states it was exploited in the wild.
Improper input validation in a firewall product leading to cross-site scripting.
Improper input validation in a firewall product enables cross-site scripting; listed as exploited in the wild.
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.