Exploited vulnerability · CISA KEV

Is CVE-2020-3452 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-3452, Cisco ASA and FTD Read-Only Path Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 469 days after it was published. It affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD), an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it 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.

What to do

1. Check whether you run it. Look for Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 22 Jul 2020.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

• CVE-2024-20481: Cisco ASA and FTD Denial-of-Service Vulnerability (24 Oct 2024)
• CVE-2024-20359: Cisco ASA and FTD Privilege Escalation Vulnerability (24 Apr 2024)
• CVE-2024-20353: Cisco ASA and FTD Denial of Service Vulnerability (24 Apr 2024)
• CVE-2020-3259: Cisco ASA and FTD Information Disclosure Vulnerability (15 Feb 2024)
• CVE-2020-3580: Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability (3 Nov 2021)

References

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

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · Cisco scorecard · act-now radar.