# What is CVE-2022-22174?

> CVE-2022-22174 is a high-severity flaw (CVSS 7.5) in Junos from Juniper, published on 19 January 2022. 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 0.9%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2022-22174

## 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 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:** 0.9% (latest exploit-likelihood forecast)
- **Published:** 19 January 2022
- **Record last updated:** 1 February 2022
- **Main product:** Junos from Juniper
- **Affected products:** 12

## What is CVE-2022-22174? 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

A vulnerability in the processing of inbound IPv6 packets in Juniper Networks Junos OS on QFX5000 Series and EX4600 switches may cause the memory to not be freed, leading to a packet DMA memory leak, and eventual Denial of Service (DoS) condition. Once the condition occurs, further packet processing will be impacted, creating a sustained Denial of Service (DoS) condition. The following error logs may be observed using the "show heap" command and the device may eventually run out of memory if such packets are received continuously. Jan 12 12:00:00 device-name fpc0 (buf alloc) failed allocating packet buffer Jan 12 12:00:01 device-name fpc0 (buf alloc) failed allocating packet buffer user@device-name> request pfe execute target fpc0 timeout 30 command "show heap" ID Base Total(b) Free(b) Used(b) % Name -- ---------- ----------- ----------- ----------- --- ----------- 0 246fc1a8 536870488 353653752 183216736 34 Kernel 1 91800000 16777216 12069680 4707536 28 DMA 2 92800000 75497472 69997640 5499832 7 PKT DMA DESC 3 106fc000 335544320 221425960 114118360 34 Bcm_sdk 4 97000000 176160768 200 176160568 99 Packet DMA <<<<<<<<<<<<<< 5 903fffe0 20971504 20971504 0 0 Blob This issue affects Juniper Networks Junos OS on QFX5000 Series, EX4600: 18.3R3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S7; 19.2 versions prior to 19.2R1-S8, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S4; 19.4 versions prior to 19.4R2-S5, 19.4R3-S6; 20.1 versions prior to 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2-S1, 21.1R3; 21.2 versions prior to 21.2R1-S1, 21.2R2. This issue does not affect Juniper Networks Junos OS: Any versions prior to 17.4R3; 18.1 versions prior to 18.1R3-S6; 18.2 versions prior to 18.2R3; 18.3 versions prior to 18.3R3; 18.4 versions prior to 18.4R2; 19.1 versions prior to 19.1R2.

### What kind of flaw is it?

- CWE-401: Missing Release of Memory after Effective Lifetime
- CWE-755: Improper Handling of Exceptional Conditions

### 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-2022-22174 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 0.9%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 0.9%, 0.9%, 0.9%, 0.9%, 0.9%, 0.9%, 0.9%.

### Timeline

- 19 January 2022: Published
- 1 February 2022: Record last updated

### How Precursor Intelligence ranks it

CVE-2022-22174 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-2022-22174?

The published record lists 12 products.

- [Junos](https://www.precursorintelligence.com/product/juniper/junos) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Operating system): 18.3, 18.3-r1, 18.3-r1-s1, 18.3-r1-s2, 18.3-r1-s3, 18.3-r1-s4, 18.3-r1-s5, 18.3-r1-s6, 18.3-r2, 18.3-r2-s1, 18.3-r2-s2, 18.3-r2-s3, 18.3-r2-s4, 18.3-r3, 18.3-r3-s1, 18.3-r3-s2, 18.3-r3-s3, 18.3-r3-s4, 18.3-r3-s5, 18.4, 18.4-r1, 18.4-r1-s1, 18.4-r1-s2, 18.4-r1-s3, 18.4-r1-s4, 18.4-r1-s5, 18.4-r1-s6, 18.4-r1-s7, 18.4-r2, 18.4-r2-s1, 18.4-r2-s2, 18.4-r2-s3, 18.4-r2-s4, 18.4-r2-s5, 18.4-r2-s6, 18.4-r2-s7, 18.4-r2-s8, 18.4-r3, 18.4-r3-s1, 18.4-r3-s2 and 107 more
- [Ex4600](https://www.precursorintelligence.com/product/juniper/ex4600) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Ex4600-Vc](https://www.precursorintelligence.com/product/juniper/ex4600-vc) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Ex4650](https://www.precursorintelligence.com/product/juniper/ex4650) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5100](https://www.precursorintelligence.com/product/juniper/qfx5100) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5110](https://www.precursorintelligence.com/product/juniper/qfx5110) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5120](https://www.precursorintelligence.com/product/juniper/qfx5120) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5130](https://www.precursorintelligence.com/product/juniper/qfx5130) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5200](https://www.precursorintelligence.com/product/juniper/qfx5200) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5210](https://www.precursorintelligence.com/product/juniper/qfx5210) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5220](https://www.precursorintelligence.com/product/juniper/qfx5220) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified
- [Qfx5700](https://www.precursorintelligence.com/product/juniper/qfx5700) by [Juniper](https://www.precursorintelligence.com/vendors/juniper) (Hardware): version not specified

## How do I fix CVE-2022-22174?

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/JSA11280) (Vendor advisory)

## Questions

### What is CVE-2022-22174?

CVE-2022-22174 is a high-severity flaw in Junos from Juniper, published on 19 January 2022. 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-2022-22174?

It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2022-22174 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-2022-22174 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 0.9%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2022-22174 affect?

For Junos from Juniper: 18.3, 18.3-r1, 18.3-r1-s1, 18.3-r1-s2, 18.3-r1-s3, 18.3-r1-s4 and 141 more. The record lists 12 products in all, each with its versions, under "Who is affected" on this page.

### How do I fix CVE-2022-22174?

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-2022-22174 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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