CVE-2019-15256

What it is

A vulnerability in the Internet Key Exchange version 1 (IKEv1) feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper management of system memory. An attacker could exploit this vulnerability by sending malicious IKEv1 traffic to an affected device. The attacker does not need valid credentials to authenticate the VPN session, nor does the attacker's source address need to match a peer statement in the crypto map applied to the ingress interface of the affected device. An exploit could allow the attacker to exhaust system memory resources, leading to a reload of an affected device.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

2.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-10-02 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-11 19:33 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.0% in the next 30 days (EPSS).
• Severity: 8.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-10-02 19:15 UTC

Last modified

2026-08-11 19:33 UTC

Exploit probability

2.0% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco Adaptive Security Appliance Software < 9.8.4.10
• Cisco Adaptive Security Appliance Software < 9.9.2.47
• Cisco Adaptive Security Appliance Software < 9.10.1.30
• Cisco Adaptive Security Appliance Software < 9.12.2.5
• Cisco Secure Firewall Threat Defense < 6.2.3.11
• Cisco Secure Firewall Threat Defense < 6.3.0.2
• Cisco Asa 5505 Firmware 9.9\(2.4\)
• Cisco Asa 5505 Firmware 201.4\(1.21\)

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-15256.md and follow it. Check whether this project is affected by CVE-2019-15256. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge