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CVE-2024-20494

Affected software2 products, listed below
Severity8.6 High CVSS 3.1
WeaknessCWE-1287
Published23 Oct 2024
Updated11 Aug 2026

Description

A vulnerability in the TLS cryptography functionality of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper data validation during the TLS 1.3 handshake. An attacker could exploit this vulnerability by sending a crafted TLS 1.3 packet to an affected system through a TLS 1.3-enabled listening socket. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: This vulnerability can also impact the integrity of a device by causing VPN HostScan communication failures or file transfer failures when Cisco ASA Software is upgraded using Cisco Adaptive Security Device Manager (ASDM).

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 2 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.52% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (cisco/secure_firewall_threat_defense). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

Affected software and releases

Products and versions

2 products, 25 version entries
SourceVendorProductSchemeAffected versions
nvd cisco adaptive security appliance software generic 9.19.1 · 9.19.1.5 · 9.19.1.9 · 9.19.1.12 · 9.19.1.18 · 9.19.1.22 · 9.19.1.24 · 9.19.1.27 · 9.19.1.28 · 9.19.1.31 · 9.20.1 · 9.20.1.5 · 9.20.2 · 9.20.2.10 · 9.20.2.21 · 9.20.2.22 · 9.20.3
nvd cisco secure firewall threat defense generic 7.3.0 · 7.3.1 · 7.3.1.1 · 7.3.1.2 · 7.4.0 · 7.4.1 · 7.4.1.1 · 7.4.2

References

URLTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-tls-CWY6zXB Mitigation, Vendor Advisory

Timeline

Published2024-10-23By the CVE Program.
NVD record modified2026-08-11NVD's own last-modified date for this record.