# CVE-2026-20070: Cisco Secure Firewall ASA and FTD cross-site scripting in VPN web services

Source: https://junglewise.ai/threats/cve-2026-20070-cisco-secure-firewall-asa-and-ftd-cross-site-scripting-in-vpn-web  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-04. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-20070 · Severity: medium · CVSS 6.1 · Published 2026-03-04

Cisco Secure Firewall ASA and FTD devices that provide VPN access to employees contain a cross-site scripting vulnerability in their web interface. An attacker could trick a user into clicking a malicious link, then execute arbitrary code in the user's browser within the context of the VPN portal, potentially stealing session tokens or credentials.

Technologies: [Cisco Secure Firewall ASA Software](https://junglewise.ai/threats/technologies/secure-firewall-asa-software), [Cisco Secure Firewall Threat Defense Software](https://junglewise.ai/threats/technologies/firepower-threat-defense-software). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2026-20070 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20070 being exploited in the wild.

**How severe is CVE-2026-20070?** Medium severity, with a CVSS score of 6.1, published 4 March 2026.

**Which products and versions are affected?** Cisco Secure Firewall ASA Software; Cisco Secure Firewall Threat Defense Software.

**Is there a fix for CVE-2026-20070?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-20070 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-20070?** Check whether you run Cisco Secure Firewall ASA Software or Cisco Secure Firewall Threat Defense Software. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a reflected cross-site scripting (XSS) vulnerability (CWE-80) in the VPN web services component due to improper validation of user-supplied input in HTTP requests. The vulnerability requires user interaction: an attacker must persuade a target to follow a crafted link to the affected device. A successful exploit allows execution of arbitrary HTML or script code in the browser context of the VPN web server. The vulnerability affects devices running vulnerable releases of ASA or FTD Software with IKEv2 Remote Access VPN (with client services) or SSL VPN features configured. Cisco has released software updates to address this vulnerability; no workarounds are available.

## Affected products

- Cisco Secure Firewall ASA Software
- Cisco Secure Firewall Threat Defense Software

## Timeline

- 2026-03-04: disclosed

## References

- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-xss-uwjc4HR](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-xss-uwjc4HR)

## Related threats

- [Cisco Secure Firewall ASA and FTD SSL VPN denial of service](https://junglewise.ai/threats/cve-2026-76418-a-vulnerability-in-the-remote-access-ssl-vpn-service-of-cisco)
- [Cisco Snort 3 GRE detection engine denial of service](https://junglewise.ai/threats/cve-2026-20179-multiple-cisco-products-are-affected-by-a-vulnerability-in-the)
- [Cisco Secure Firewall ASA calculation error in security-critical context](https://junglewise.ai/threats/cve-2026-20335-cisco-secure-firewall-asa-calculation-error-in-security-critical)
- [Cisco Secure Firewall improper adherence to coding standards](https://junglewise.ai/threats/cve-2026-20334-cisco-secure-firewall-improper-adherence-to-coding-standards)
- [Cisco Secure Firewall ASA/FTD/FMC incorrect comparison in security context](https://junglewise.ai/threats/cve-2026-20333-cisco-secure-firewall-asa-ftd-fmc-incorrect-comparison-in)