CVE-2018-0101

What it is

A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a reload of the affected system or to remotely execute code. The vulnerability is due to an attempt to double free a region of memory when the webvpn feature is enabled on the Cisco ASA device. An attacker could exploit this vulnerability by sending multiple, crafted XML packets to a webvpn-configured interface on the affected system. An exploit could allow the attacker to execute arbitrary code and obtain full control of the system, or cause a reload of the affected device. This vulnerability affects Cisco ASA Software that is running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, ASA 1000V Cloud Firewall, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4110 Security Appliance, Firepower 9300 ASA Security Module, Firepower Threat Defense Software (FTD). Cisco Bug IDs: CSCvg35618.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

86.8% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

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

Timeline

1. 2017-11-27 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2018-01-29 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 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: 86.8% in the next 30 days (EPSS).
• Severity: 10.0 CRITICAL (CVSS).
• Fix: a patch or advisory is linked.
• It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published

2018-01-29 20:29 UTC

Last modified

2026-08-11 19:33 UTC

Exploit probability

86.8% · EPSS, next 30 days

Weakness

CWE-415

Record status

Modified

Affected

• Cisco Adaptive Security Appliance Software < 9.1.7.23
• Cisco Adaptive Security Appliance Software < 9.2.4.27
• Cisco Adaptive Security Appliance Software < 9.4.4.16
• Cisco Adaptive Security Appliance Software < 9.6.4.3
• Cisco Adaptive Security Appliance Software < 9.7.1.21
• Cisco Adaptive Security Appliance Software < 9.8.2.20
• Cisco Adaptive Security Appliance Software < 9.9.1.2
• Cisco Secure Firewall Threat Defense 6.0.0

Attack profile CVSS 3.0 · 10.0

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

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-2018-0101.md and follow it. Check whether this project is affected by CVE-2018-0101. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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