Exploited vulnerability · CISA KEV

Is CVE-2020-3259 exploited? Yes: in CISA KEV since 15 Feb 2024

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

Yes. CVE-2020-3259, Cisco ASA and FTD Information Disclosure Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 15 Feb 2024, 1380 days after it was published. It is known to be used in ransomware campaigns. 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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it is

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an information disclosure vulnerability. An attacker could retrieve memory contents on an affected device, which could lead to the disclosure of confidential information due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. This vulnerability affects only specific AnyConnect and WebVPN configurations.

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 mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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 6 May 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-2020-3452: Cisco ASA and FTD Read-Only Path Traversal Vulnerability (3 Nov 2021)
• CVE-2020-3580: Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability (3 Nov 2021)

References

• tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaf
• nvd.nist.gov/vuln/detail/CVE-2020-3259

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 February 2024 · Cisco scorecard · act-now radar.