CVE-2020-3259 — Security Box Score

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Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-3259HIGH

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Information Disclosure Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  N  N    7.5   .6934   99.3   YES

AFFECTED
  Product                                           Versions  Fixed
  Cisco Adaptive Security Appliance (ASA) Software  n/a –     —

TIMELINE
  Dec 12  Reserved by cisco
  Feb 15  Added to CISA KEV, remediation due 2024-03-07
  Feb 15  Published (CNA: cisco)

CWE-200 · CNA: cisco · CVSS v3.1 · 2 references · NVD status: Analyzed · KEV due March 7, 2024

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 12, 2019	Reserved	Reserved by cisco
February 15, 2024	KEV ADDED	Added to CISA KEV, remediation due 2024-03-07
February 15, 2024	Published	Published (CNA: cisco)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Cisco	Cisco Adaptive Security Appliance (ASA) Software	—	n/a	—

Weaknesses

CWE-200

References (2)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB [Vendor Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3259 [US Government Resource]

Authoritative record: CVE-2020-3259 at cve.org

Vendors: cisco

Weaknesses: CWE-200

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-3259 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.