CVE-2020-3259: Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) (High, CVSS 7.5)
- CVSS
- 7.5 High (v3.1)
- EPSS
- 71.5% chance of exploitation in the next 30 days (higher than 99.4% of CVEs)
- Exploited in the wild
- Yes, on CISA’s KEV list since Feb 15, 2024; used by ransomware
- Public exploit
- None reported in public exploit databases
- Weakness
- CWE-200
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Published
- May 6, 2020
- CISA fix-by date
- Mar 7, 2024 (for US federal agencies)
What it is
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.
Description from the National Vulnerability Database.
What to do
CISA: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Check whether you run Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD), then apply the vendor’s fix or mitigation from the advisories below. Because this flaw is exploited or has public exploit code, treat it as urgent and check for signs of compromise, not just the patch level.
Advisories and fixes
ThreatRoundup coverage
SafePay Ransomware Hit 600 Victims Using Stolen VPN Logins and Old Bugs
Sources: NVD, FIRST EPSS, CISA KEV, and public exploit databases (availability only). ThreatRoundup reports whether public exploit code exists but never links to it: fake proof-of-concepts that infect security researchers are common. This page updates automatically.