CVE-2024-20359

Published Apr 24, 2024

Last updated 9 months ago

Overview

Description
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.
Source
psirt@cisco.com
NVD status
Analyzed
Products
adaptive_security_appliance_software, firepower_threat_defense

Risk scores

CVSS 3.1

Type
Primary
Base score
6
Impact score
5.2
Exploitability score
0.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Severity
MEDIUM

Known exploits

Data from CISA

Vulnerability name
Cisco ASA and FTD Privilege Escalation Vulnerability
Exploit added on
Apr 24, 2024
Exploit action due
May 1, 2024
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Weaknesses

psirt@cisco.com
CWE-94
nvd@nist.gov
CWE-94

Social media

Hype score
Not currently trending
  1. Cisco ASA zero-days aren't new, but CVE-2024-20359 is different. Attackers are actively leveraging it for persistent implants that survive reboots and patches. The lesson: reactive patching isn't enough. You must hunt for root-cause compromises.

    @ro0TCr4k

    15 Jul 2026

    88 Impressions

    1 Retweet

    2 Likes

    0 Bookmarks

    0 Replies

    1 Quote

  2. Top 5 Trending CVEs: 1 - CVE-2026-31431 2 - CVE-2026-41940 3 - CVE-2026-3910 4 - CVE-2024-20359 5 - CVE-2024-20353 #cve #cvetrends #cveshield #cybersecurity https://t.co/4Fua3CAN6W

    @CVEShield

    3 May 2026

    120 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  3. CVE-2024-20359. CVE-2024-20359 added to CISA KEV: Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

    @lyrie_ai

    3 May 2026

    70 Impressions

    0 Retweets

    1 Like

    0 Bookmarks

    1 Reply

    0 Quotes

  4. Cisco社が、同社のSecure Email Gatewayなどに搭載されているOS「AsyncOS」のゼロデイ脆弱性(CVE-2024-20359)への修正パッチを公開しました。 この脆弱性は、2025年11月から実際に攻撃に悪用されていたことが確認されて

    @omomuki_tech

    16 Jan 2026

    38 Impressions

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

  5. Lua: still stealthy, still relevant. In 2025, we saw Line Runner - a Lua webshell embedded in Cisco ASA firewalls by the ArcaneDoor crew, executed via WebVPN customization (CVE-2024-20359) to run arbitrary Lua tasks. https://t.co/UQZeZPVkyd And remember 2024? Gamers chasing ht

    @M_haggis

    8 Sept 2025

    1760 Impressions

    5 Retweets

    19 Likes

    3 Bookmarks

    0 Replies

    0 Quotes

  6. Flaw (CVE-2024-20359) lets attackers bypass authentication. Patch now or risk network breach! 🔐 Zoffec can help. 📧 info@zoffec.com | 📞 +91 9819478648 #Cisco #CyberAlert #Zoffec #Vulnerability #PatchNow https://t.co/kxE0Toh8Ar

    @Zoffecinfotech

    29 Jul 2025

    1 Impression

    0 Retweets

    0 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

Configurations