CVE-2020-3452

What the flaw is

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an improper input validation vulnerability when HTTP requests process URLs. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply updates per vendor instructions.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

156 public repositories referencing this CVE have been catalogued on GitHub. That volume usually means a reliable, widely-reproduced exploit. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

• 0day404/vulnerability-poc
• 0ps/pocassistdb
• 0x5ECF4ULT/CVE-2020-3452
• 0xPugal/One-Liners
• 0xPugazh/One-Liners
• 0xT11/CVE-POC
• 0xfoysal/Tools
• 0xget/cve-2001-1473

Showing 8 of 156. Full list in the trickest/cve dataset.

Vendor advisories

• nvd.nist.gov/vuln/detail/CVE-2020-3452

Primary sources

• NVD entry — CVSS score, CPE list and references
• CISA KEV catalog — the source for this page
• CVE Record at cve.org