# CVE-2024-20359 — Cisco Adaptive Security Appliance (ASA) Software **CISA KEV** > As of 2025-10-21, CVE-2024-20359 is a MEDIUM-severity vulnerability in Cisco Adaptive Security Appliance (ASA) Software, CVSS v3.1 6, EPSS 19.4% (97.3th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-04-24), with a US federal remediation deadline of 2024-05-01. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2024-20359, most recently “Sen. Wyden Urges Binding Federal Mandate to Purge Internet-Facing Legacy VPNs for Zero-Trust Remote Access”. **Last updated:** 2025-10-21 ## What is CVE-2024-20359? A vulnerability in a legacy capability that allowed for the preloading of VPN clients and plug-ins and that has been available in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute arbitrary code with root-level privileges. Administrator-level privileges are required to exploit this vulnerability. This vulnerability is due to improper validation of a file when it is read from system flash memory. An attacker could exploit this vulnerability by copying a crafted file to the disk0: file system of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the affected device after the next reload of the device, which could alter system behavior. Because the injected code could persist across device reboots, Cisco has raised the Security Impact Rating (SIR) of this advisory from Medium to High. The record classifies CVE-2024-20359 under weakness class [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). Its CVSS v3 base vector states that the flaw requires local access to the host, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 904 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 6 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N`) - **EPSS (FIRST):** 19.4% probability of exploitation in the next 30 days, higher than 97.3% of all scored CVEs - **CISA KEV:** Listed since 2024-04-24, federal remediation deadline 2024-05-01 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2024-04-24, last modified 2025-10-21 ## Is CVE-2024-20359 being exploited? CISA added CVE-2024-20359 to the Known Exploited Vulnerabilities catalog on 2024-04-24, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-05-01 under BOD 22-01. Weaponised exploit code for CVE-2024-20359 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 47 in the Threadlinqs vulnerability feed. - [trickest/cve](https://github.com/trickest/cve/blob/main/2024/CVE-2024-20359.md) (trickest) ## Affected products and versions - [Cisco](https://intel.threadlinqs.com/vendors/cisco): Adaptive Security Appliance (ASA) Software, Firepower Threat Defense Software ## How to fix CVE-2024-20359 Because CVE-2024-20359 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-05-01. No vendor patch reference has been recorded for CVE-2024-20359 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2024-20359 1 tracked threat in the Threadlinqs corpus references CVE-2024-20359, either in the campaign’s CVE list or as an indicator on the campaign record. - [Sen. Wyden Urges Binding Federal Mandate to Purge Internet-Facing Legacy VPNs for Zero-Trust Remote Access](https://intel.threadlinqs.com/threat/TL-2026-1774) — MEDIUM · 2026-07-27 ## Sources Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10. **Other references** - [sec.cloudapps.cisco.com](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-persist-rce-FLsNXF4h) Canonical: https://intel.threadlinqs.com/cve/CVE-2024-20359 Full detection coverage and IOCs for threats exploiting CVE-2024-20359 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp