Junos OS: PTX Series: FPCs may restart unexpectedly upon receipt of specific MPLS packets with certain multi-unit interface configurations

Description

An Improper Handling of Exceptional Conditions vulnerability on specific PTX Series devices, including the PTX1000, PTX3000 (NextGen), PTX5000, PTX10002-60C, PTX10008, and PTX10016 Series, in Juniper Networks Junos OS allows an unauthenticated MPLS-based attacker to cause a Denial of Service (DoS) by triggering the dcpfe process to crash and FPC to restart. On affected PTX Series devices, processing specific MPLS packets received on an interface with multiple units configured may cause FPC to restart unexpectedly. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects PTX Series devices utilizing specific FPCs found on PTX1000, PTX3000 (NextGen), PTX5000, PTX10002-60C, PTX10008, and PTX10016 Series devices, only if multiple units are configured on the ingress interface, and at least one unit has 'family mpls' *not* configured. See the configuration sample below for more information. No other platforms are affected by this vulnerability. This issue affects: Juniper Networks Junos OS on PTX Series: All versions prior to 19.1R3-S9; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R3-S8; 20.1 versions prior to 20.1R3-S4; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S4; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S2; 21.2 versions prior to 21.2R3-S1; 21.3 versions prior to 21.3R3; 21.4 versions prior to 21.4R2; 22.1 versions prior to 22.1R2.

Scores

EPSS (exploitation in 30 days)

0.54% · top 55% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• CWE-755 Improper Handling of Exceptional Conditions (opens in a new tab)All about CWE-755 and its CVEs
• Denial of Service (DoS)

Affected products

• Juniper Networks · Junos OS

  • affected unspecified – < 19.1R3-S9
  • affected 19.2 – < 19.2R3-S6
  • affected 19.3 – < 19.3R3-S6
  • affected 19.4 – < 19.4R3-S8
  • affected 20.1 – < 20.1R3-S4
  • affected 20.2 – < 20.2R3-S5
  • affected 20.3 – < 20.3R3-S4
  • affected 20.4 – < 20.4R3-S4
  • affected 21.1 – < 21.1R3-S2
  • affected 21.2 – < 21.2R3-S1
  • affected 21.3 – < 21.3R3
  • affected 21.4 – < 21.4R2
  • affected 22.1 – < 22.1R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS 19.1R3-S9, 19.2R3-S6, 19.3R3-S6, 19.4R3-S8, 20.1R3-S4, 20.2R3-S5, 20.3R3-S4, 20.4R3-S4, 21.1R3-S2, 21.2R3-S1, 21.3R3, 21.4R2, 22.1R2, 22.2R1, and all subsequent releases.

Workaround: The FPC crash only occurs if specific MPLS packets are received on an interface with multiple units configured and at least one unit has family mpls not configured. Also, the first unit with family mpls configured is not the lowest numerical unit on that interface. A viable config-based workaround would be to reorder the unit numbers on core-facing interfaces to ensure the numerically lowest unit has 'family mpls' configured.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

• https://kb.juniper.net/JSA69706 (opens in a new tab)x_refsource_CONFIRMx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-22202](https://trackcve.app/badge/CVE-2022-22202.svg)](https://trackcve.app/cve/CVE-2022-22202)

Record last updated 17 Sept 2024, 01:36 UTC.