# What is CVE-2019-0063?

> CVE-2019-0063 is a high-severity flaw (CVSS 7.5) in Junos from Juniper, published on 9 October 2019. 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 1.3%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2019-0063

## 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:** 46 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 7.5 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:** 1.3% (latest exploit-likelihood forecast)
- **Published:** 9 October 2019
- **Record last updated:** 21 July 2021
- **Main product:** Junos from Juniper
- **Affected products:** 18

## What is CVE-2019-0063? 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

When an MX Series Broadband Remote Access Server (BRAS) is configured as a Broadband Network Gateway (BNG) with DHCPv6 enabled, jdhcpd might crash when receiving a specific crafted DHCP response message on a subscriber interface. The daemon automatically restarts without intervention, but continuous receipt of specific crafted DHCP messages will repeatedly crash jdhcpd, leading to an extended Denial of Service (DoS) condition. This issue only affects systems configured with DHCPv6 enabled. DHCPv4 is unaffected by this issue. This issue affects Juniper Networks Junos OS: 15.1 versions prior to 15.1R7-S5 on MX Series; 16.1 versions prior to 16.1R7-S5 on MX Series; 16.2 versions prior to 16.2R2-S10 on MX Series; 17.1 versions prior to 17.1R3-S1 on MX Series; 17.2 versions prior to 17.2R3-S2 on MX Series; 17.3 versions prior to 17.3R3-S6 on MX Series; 17.4 versions prior to 17.4R2-S5, 17.4R3 on MX Series; 18.1 versions prior to 18.1R3-S6 on MX Series; 18.2 versions prior to 18.2R2-S4, 18.2R3 on MX Series; 18.2X75 versions prior to 18.2X75-D50 on MX Series; 18.3 versions prior to 18.3R1-S5, 18.3R3 on MX Series; 18.4 versions prior to 18.4R2 on MX Series; 19.1 versions prior to 19.1R1-S2, 19.1R2 on MX Series.

### What kind of flaw is it?

- 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:U/C:N/I:N/A:H`

## Is CVE-2019-0063 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 1.3%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 1.3%, 1.3%, 1.3%, 1.3%, 1.3%, 1.3%, 1.3%.

### Timeline

- 9 October 2019: Published
- 21 July 2021: Record last updated

### How Precursor Intelligence ranks it

CVE-2019-0063 scores **46 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-2019-0063?

The published record lists 18 products.

- [Junos](https://www.precursorintelligence.com/product/juniper/junos) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Operating system): 15.1-a1, 15.1-f1, 15.1-f2, 15.1-f2-s1, 15.1-f2-s2, 15.1-f2-s3, 15.1-f2-s4, 15.1-f3, 15.1-f4, 15.1-f5, 15.1-f6, 15.1-f6-s3, 15.1-f7, 15.1-r1, 15.1-r2, 15.1-r3, 15.1-r4, 15.1-r4-s9, 15.1-r5, 15.1-r6, 15.1-r6-s6, 15.1-r7-s1, 15.1-r7-s2, 15.1-r7-s3, 15.1-r7-s4, 16.1, 16.1-r1, 16.1-r2, 16.1-r3, 16.1-r3-s10, 16.1-r4, 16.1-r5, 16.1-r5-s4, 16.1-r6, 16.1-r6-s1, 16.1-r7, 16.1-r7-s4, 16.2, 16.2-r1, 16.2-r2 and 79 more
- [Mx10](https://www.precursorintelligence.com/product/juniper/mx10) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx10003](https://www.precursorintelligence.com/product/juniper/mx10003) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx10008](https://www.precursorintelligence.com/product/juniper/mx10008) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx10016](https://www.precursorintelligence.com/product/juniper/mx10016) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx104](https://www.precursorintelligence.com/product/juniper/mx104) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx150](https://www.precursorintelligence.com/product/juniper/mx150) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx2008](https://www.precursorintelligence.com/product/juniper/mx2008) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx2010](https://www.precursorintelligence.com/product/juniper/mx2010) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx2020](https://www.precursorintelligence.com/product/juniper/mx2020) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx204](https://www.precursorintelligence.com/product/juniper/mx204) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx240](https://www.precursorintelligence.com/product/juniper/mx240) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx40](https://www.precursorintelligence.com/product/juniper/mx40) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx480](https://www.precursorintelligence.com/product/juniper/mx480) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx5](https://www.precursorintelligence.com/product/juniper/mx5) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx80](https://www.precursorintelligence.com/product/juniper/mx80) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Mx960](https://www.precursorintelligence.com/product/juniper/mx960) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Vmx](https://www.precursorintelligence.com/product/juniper/vmx) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified

## How do I fix CVE-2019-0063?

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

- [kb.juniper.net](https://kb.juniper.net/JSA10962) (Vendor advisory)

## Questions

### What is CVE-2019-0063?

CVE-2019-0063 is a high-severity flaw in Junos from Juniper, published on 9 October 2019. 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-2019-0063?

It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2019-0063 is 46 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-2019-0063 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 1.3%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2019-0063 affect?

For Junos from Juniper: 15.1-a1, 15.1-f1, 15.1-f2, 15.1-f2-s1, 15.1-f2-s2, 15.1-f2-s3 and 113 more. The record lists 18 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2019-0063?

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-2019-0063 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.

Start free (no card, nothing to install): https://www.precursorintelligence.com/register
Book a demo: https://www.precursorintelligence.com/contact