All vulnerabilities
CVE-2020-3259

Cisco ASA and FTD Information Disclosure Vulnerability

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)Network & edge
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationExploited in the wildAdded to KEV 15 Feb 2024. Known ransomware useCISA KEV
Exploit odds (EPSS)71.5%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline7 Mar 2024Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 6 May 2020, 16:41 UTCPublishedCVE List
  2. 15 Feb 2024Added to CISA KEVCISA KEV
  3. 20 Oct 2026, 12:00 UTCFirst reported exploitedCISA advisories

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

One outlet reports exploitation. Reports are not confirmation; each links to its source.

Description

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.

Text from CVE List

Affected versions 1

  • Cisco Adaptive Security Appliance (ASA) Softwareaffected: n/aCVE List

References 3