Cisco ASA CVE-2014-2120: WebVPN Login XSS, in KEV 2024
A low-impact, user-assisted bug from 2014; the real signal is that botnets still probe ASA VPN portals, so make sure no ASA is on decade-old software, which would also carry far worse exploited flaws.
Must act: Owners of Cisco ASA appliances with WebVPN or AnyConnect portals enabled that still run 2014-era software or have not been upgraded in years.
Can relax: Teams whose ASAs run a currently supported release and follow Cisco's recent advisories; this bug does not compromise the firewall itself.
- Run show version on every ASA and confirm it is on a currently supported release with recent security fixes.
- Upgrade any ASA still on 2014-era 8.x or 9.0/9.1 software; there is no workaround for this bug.
- Check that later exploited ASA bugs are also fixed, including CVE-2020-3259 and CVE-2025-20333/CVE-2025-20362.