CVE-2022-22194

Junos OS Evolved: PTX series: An attacker sending a crafted GRE packet will cause the PFE to restart

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the packetIO daemon of Juniper Networks Junos OS Evolved on PTX10003, PTX10004, and PTX10008 allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). Continued receipt of these crafted packets will cause a sustained Denial of Service condition. This issue affects Juniper Networks Junos OS Evolved all versions prior to 20.4R2-S3-EVO on PTX10003, PTX10004, and PTX10008. This issue does not affect: Juniper Networks Junos OS Evolved versions 21.1R1-EVO and above; Juniper Networks Junos OS.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: 20.4R2-S3-EVO, 20.4R3-EVO.

Workaround:

  • One characteristic of this vulnerability is that an FPC restart will only be triggered by a crafted GRE packet which has its' TTL set to 0 or 1 so as a workaround a filter can be implemented that drops such packets: set firewall family inet filter GREfilter term 1 from protocol gre set firewall family inet filter GREfilter term 1 from ttl 0 set firewall family inet filter GREfilter term 1 then count gre-ttl-0 set firewall family inet filter GREfilter term 1 then discard set firewall family inet filter GREfilter term 2 from protocol gre set firewall family inet filter GREfilter term 2 from ttl 1 set firewall family inet filter GREfilter term 2 then count gre-ttl-1 set firewall family inet filter GREfilter term 2 then discard set firewall family inet filter GREfilter term default then accept An equivalent filter for family inet6 is required if IPv6 is configured on at least one interface.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.16%
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS Evolved
Affected: Juniper Networks Junos OS Evolved
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://kb.juniper.net/JSA69505 mitigation vendor advisory

Frequently Asked Questions

What is the severity of CVE-2022-22194?
CVE-2022-22194 has been scored as a high severity vulnerability.
How to fix CVE-2022-22194?
To fix CVE-2022-22194: The following software releases have been updated to resolve this specific issue: 20.4R2-S3-EVO, 20.4R3-EVO.
Is CVE-2022-22194 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-22194 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-22194?
CVE-2022-22194 affects Juniper Networks Junos OS Evolved, Juniper Networks Junos OS Evolved, Juniper Networks Junos OS.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.