CVE-2021-0208

Summary

An improper input validation vulnerability in the Routing Protocol Daemon (RPD) service of Juniper Networks Junos OS allows an attacker to send a malformed RSVP packet when bidirectional LSPs are in use, which when received by an egress router crashes the RPD causing a Denial of Service (DoS) condition. Continued receipt of the packet will sustain the Denial of Service. This issue affects: Juniper Networks Junos OS: All versions prior to 17.3R3-S10 except 15.1X49-D240 for SRX series; 17.4 versions prior to 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S4; 18.3 versions prior to 18.3R3-S2; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S2; 19.1 versions prior to 19.1R1-S5, 19.1R3-S3; 19.2 versions prior to 19.2R3; 19.3 versions prior to 19.3R2-S5, 19.3R3; 19.4 versions prior to 19.4R2-S2, 19.4R3-S1; 20.1 versions prior to 20.1R1-S4, 20.1R2; 15.1X49 versions prior to 15.1X49-D240 on SRX Series. Juniper Networks Junos OS Evolved: 19.3 versions prior to 19.3R2-S5-EVO; 19.4 versions prior to 19.4R2-S2-EVO; 20.1 versions prior to 20.1R1-S4-EVO.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OSunspecified < 17.3R3-S10affected
Juniper NetworksJunos OS17.4 < 17.4R3-S2affected
Juniper NetworksJunos OS18.1 < 18.1R3-S10affected
Juniper NetworksJunos OS18.2 < 18.2R2-S7, 18.2R3-S4affected
Juniper NetworksJunos OS18.3 < 18.3R3-S2affected
Juniper NetworksJunos OS18.4 < 18.4R1-S8, 18.4R2-S6, 18.4R3-S2affected
Juniper NetworksJunos OS19.1 < 19.1R1-S5, 19.1R3-S3affected
Juniper NetworksJunos OS19.2 < 19.2R3affected
Juniper NetworksJunos OS19.3 < 19.3R2-S5, 19.3R3affected
Juniper NetworksJunos OS19.4 < 19.4R2-S2, 19.4R3-S1affected
Juniper NetworksJunos OS20.1 < 20.1R1-S4, 20.1R2affected
Juniper NetworksJunos OS15.1X49 < 15.1X49-D240affected
Juniper NetworksJunos OS Evolved19.3 < 19.3R2-S5-EVOaffected
Juniper NetworksJunos OS Evolved19.4 < 19.4R2-S2-EVOaffected
Juniper NetworksJunos OS Evolved20.1 < 20.1R1-S4-EVOaffected

Weaknesses

  • CWE-20: CWE-20: Improper Input Validation
  • Denial of Service (DoS)

Workarounds

If bidirectional LSPs are running in the network, when changing family mpls maximum-labels on an interface, first disable RSVP for this interface. You can include the disable statement at the following hierarchy levels: [edit protocols rsvp interface interface-name ] [edit logical-systems logical-system-name protocols rsvp interface interface-name ]

See the MPLS RSVP disable configuration guide for further details.

ADP Enrichment

CVE Program Container

Additional References

References