# What is CVE-2018-0240?

> CVE-2018-0240 is a high-severity flaw (CVSS 8.6) in Firepower Threat Defense from Cisco, published on 19 April 2018. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 3.9%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2018-0240

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **Precursor Intelligence risk score:** 47 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 8.6 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 3.9% (latest exploit-likelihood forecast)
- **Published:** 19 April 2018
- **Record last updated:** 15 August 2023
- **Main product:** Firepower Threat Defense from Cisco
- **Affected products:** 47

## What is CVE-2018-0240? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### The official description

Multiple vulnerabilities in the Application Layer Protocol Inspection 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 vulnerabilities are due to logical errors during traffic inspection. An attacker could exploit these vulnerabilities by sending a high volume of malicious traffic across an affected device. An exploit could allow the attacker to cause a deadlock condition, resulting in a reload of an affected device. These vulnerabilities affect Cisco ASA Software and Cisco FTD Software configured for Application Layer Protocol Inspection 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, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCve61540, CSCvh23085, CSCvh95456.

### What kind of flaw is it?

- Unknown: Unknown
- Unknown: Unknown

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can take it offline

Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`

## Is CVE-2018-0240 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 3.9%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 3.9%, 3.9%, 3.9%, 3.9%, 3.9%, 3.9%, 3.9%.

### Timeline

- 19 April 2018: Published
- 15 August 2023: Record last updated

### How Precursor Intelligence ranks it

CVE-2018-0240 scores **47 out of 100 (Medium)**, with the action "Plan remediation".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2018-0240?

The published record lists 47 products. Versions are as published: "6.2.0 to before 6.2.0.5" means from 6.2.0 up to, but not including, 6.2.0.5.

- [Firepower Threat Defense](https://www.precursorintelligence.com/product/cisco/firepower_threat_defense) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): 6.1.0 to 6.1.0.7, 6.2.0 to before 6.2.0.5, 6.2.1 to before 6.2.2.2
- [Adaptive Security Appliance Software](https://www.precursorintelligence.com/product/cisco/adaptive_security_appliance_software) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Operating system): 9.6.0.0 to before 9.6.4.6, 9.7.0.0 to before 9.7.1.24, 9.8.0.0 to before 9.8.2.24, 9.9.0.0 to before 9.9.1.4
- [7604](https://www.precursorintelligence.com/product/cisco/7604) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [7606-S](https://www.precursorintelligence.com/product/cisco/7606-s) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [7609-S](https://www.precursorintelligence.com/product/cisco/7609-s) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [7613-S](https://www.precursorintelligence.com/product/cisco/7613-s) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Adaptive Security Virtual Appliance](https://www.precursorintelligence.com/product/cisco/adaptive_security_virtual_appliance) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- [ASA 5506-X](https://www.precursorintelligence.com/product/cisco/asa_5506-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5506w-X](https://www.precursorintelligence.com/product/cisco/asa_5506w-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5508-X](https://www.precursorintelligence.com/product/cisco/asa_5508-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5510](https://www.precursorintelligence.com/product/cisco/asa_5510) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5516-X](https://www.precursorintelligence.com/product/cisco/asa_5516-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5525-X](https://www.precursorintelligence.com/product/cisco/asa_5525-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5550](https://www.precursorintelligence.com/product/cisco/asa_5550) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5555-X](https://www.precursorintelligence.com/product/cisco/asa_5555-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA 5580](https://www.precursorintelligence.com/product/cisco/asa_5580) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5505](https://www.precursorintelligence.com/product/cisco/asa-5505) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5506-X](https://www.precursorintelligence.com/product/cisco/asa-5506-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5506h-X](https://www.precursorintelligence.com/product/cisco/asa-5506h-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5512-X](https://www.precursorintelligence.com/product/cisco/asa-5512-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5515-X](https://www.precursorintelligence.com/product/cisco/asa-5515-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5520](https://www.precursorintelligence.com/product/cisco/asa-5520) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5540](https://www.precursorintelligence.com/product/cisco/asa-5540) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5545-X](https://www.precursorintelligence.com/product/cisco/asa-5545-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5555-X](https://www.precursorintelligence.com/product/cisco/asa-5555-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [ASA-5585-X](https://www.precursorintelligence.com/product/cisco/asa-5585-x) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6500-E](https://www.precursorintelligence.com/product/cisco/catalyst_6500-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6503-E](https://www.precursorintelligence.com/product/cisco/catalyst_6503-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6504-E](https://www.precursorintelligence.com/product/cisco/catalyst_6504-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6506-E](https://www.precursorintelligence.com/product/cisco/catalyst_6506-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6509-E](https://www.precursorintelligence.com/product/cisco/catalyst_6509-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6509-Neb-a](https://www.precursorintelligence.com/product/cisco/catalyst_6509-neb-a) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6509-V-E](https://www.precursorintelligence.com/product/cisco/catalyst_6509-v-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6513](https://www.precursorintelligence.com/product/cisco/catalyst_6513) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Catalyst 6513-E](https://www.precursorintelligence.com/product/cisco/catalyst_6513-e) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 2110](https://www.precursorintelligence.com/product/cisco/firepower_2110) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 2120](https://www.precursorintelligence.com/product/cisco/firepower_2120) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 2130](https://www.precursorintelligence.com/product/cisco/firepower_2130) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 2140](https://www.precursorintelligence.com/product/cisco/firepower_2140) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 4110](https://www.precursorintelligence.com/product/cisco/firepower_4110) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 4120](https://www.precursorintelligence.com/product/cisco/firepower_4120) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 4140](https://www.precursorintelligence.com/product/cisco/firepower_4140) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 4150](https://www.precursorintelligence.com/product/cisco/firepower_4150) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower 9300](https://www.precursorintelligence.com/product/cisco/firepower_9300) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Firepower Threat Defense Virtual](https://www.precursorintelligence.com/product/cisco/firepower_threat_defense_virtual) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Application): version not specified
- [Isa-3000-2c2f](https://www.precursorintelligence.com/product/cisco/isa-3000-2c2f) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified
- [Isa-3000-4c](https://www.precursorintelligence.com/product/cisco/isa-3000-4c) by [Cisco](https://www.precursorintelligence.com/vendors/cisco) (Hardware): version not specified

## How do I fix CVE-2018-0240?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [tools.cisco.com](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect) (Vendor advisory)
- [securityfocus.com](http://www.securityfocus.com/bid/103934) (Third-party advisory, Vulnerability database)
- [securitytracker.com](http://www.securitytracker.com/id/1040722) (Broken link, Third-party advisory, Vulnerability database)
- [ics-cert.us-cert.gov](https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01) (Government resource, Third-party advisory)

## Questions

### What is CVE-2018-0240?

CVE-2018-0240 is a high-severity flaw in Firepower Threat Defense from Cisco, published on 19 April 2018. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### How serious is CVE-2018-0240?

It scores 8.6 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2018-0240 is 47 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2018-0240 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 3.9%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2018-0240 affect?

For Firepower Threat Defense from Cisco: 6.1.0 to 6.1.0.7, 6.2.0 to before 6.2.0.5, 6.2.1 to before 6.2.2.2. The record lists 47 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2018-0240?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2018-0240 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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