Information disclosure in Cisco Adaptive Security Appliance Software

CVE-2020-3259

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.

Vulnerability class: Information Disclosure

EPSS: 0.718 (99.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-3259?
CVE-2020-3259 is a high-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Information Disclosure. CVSS score: 7.5/10. Published 2020-05-06.
How severe is CVE-2020-3259?
High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-3259 known to be exploited?
Yes. CVE-2020-3259 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-02-15), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.