CVE-2021-0208

Junos OS and Junos OS Evolved: In bidirectional LSP configurations, on MPLS egress router RPD may core upon receipt of specific malformed RSVP packet.

HIGH

8.8

CVSS Score

Published: January 15, 2021 at 05:35 PM UTC

Updated: June 17, 2026 at 03:29 AM UTC

16 products affected across 2 vendorsJunosJunos OS EvolvedSRX5800

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Severity

HIGH8.8

Exploit prediction

EPSS 0.7%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

19.3 r1 19.3 r2 19.4 r1 19.4 r2 19.4 r2-s1 20.1 20.1 r1 20.1 r1-s1

Junos · Juniper Networks

95%

v < 17.3R3-S1015.1X49 ≤ v < 15.1X49-D24017.4 ≤ v < 17.4R3-S218.1 ≤ v < 18.1R3-S1018.2 ≤ v < 18.2R2-S7, 18.2R3-S418.3 ≤ v < 18.3R3-S218.4 ≤ v < 18.4R1-S8, 18.4R2-S6, 18.4R3-S219.1 ≤ v < 19.1R1-S5, 19.1R3-S319.2 ≤ v < 19.2R319.3 ≤ v < 19.3R2-S5, 19.3R319.4 ≤ v < 19.4R2-S2, 19.4R3-S120.1 ≤ v < 20.1R1-S4, 20.1R215.1X4915.1x4915.1x49 d10 15.1x49 d100 15.1x49 d110 15.1x49 d120 15.1x49 d130 15.1x49 d140 15.1x49 d15 15.1x49 d150 15.1x49 d160 15.1x49 d170 15.1x49 d180 15.1x49 d190 15.1x49 d20 15.1x49 d200 15.1x49 d210 15.1x49 d25 15.1x49 d30 15.1x49 d35 15.1x49 d40 15.1x49 d45 15.1x49 d50 15.1x49 d55 15.1x49 d60 15.1x49 d65 15.1x49 d70 15.1x49 d75 15.1x49 d80 15.1x49 d90 17.3 17.3 r1-s1 17.3 r2 17.3 r2-s1 17.3 r2-s2 17.3 r2-s3 17.3 r2-s4 17.3 r2-s5 17.3 r3 17.3 r3-s1 17.3 r3-s2 17.3 r3-s3 17.3 r3-s4 17.3 r3-s7 17.3 r3-s8 17.3 r3-s9 17.4 17.4 r1 17.4 r1-s1 17.4 r1-s2 17.4 r1-s4 17.4 r1-s5 17.4 r1-s6 17.4 r1-s7 17.4 r2 17.4 r2-s1 17.4 r2-s10 17.4 r2-s11 17.4 r2-s2 17.4 r2-s3 17.4 r2-s4 17.4 r2-s5 17.4 r2-s6 17.4 r2-s7 17.4 r2-s8 17.4 r2-s9 17.4 r3 17.4 r3-s1 18.1 18.1 r1 18.1 r2 18.1 r2-s1 18.1 r2-s2 18.1 r2-s4 18.1 r3 18.1 r3-s1 18.1 r3-s2 18.1 r3-s3 18.1 r3-s4 18.1 r3-s6 18.1 r3-s7 18.1 r3-s8 18.1 r3-s9 18.2 18.2 r1 18.2 r1-s3 18.2 r1-s4 18.2 r1-s5 18.2 r2 18.2 r2-s1 18.2 r2-s2 18.2 r2-s3 18.2 r2-s4 18.2 r2-s5 18.2 r2-s6 18.2 r3 18.2 r3-s1 18.2 r3-s2 18.2 r3-s3 18.3 18.3 r1 18.3 r1-s1 18.3 r1-s2 18.3 r1-s3 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 18.4 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 r3 18.4 r3-s1 19.1 19.1 r1 19.1 r1-s1 19.1 r1-s2 19.1 r1-s3 19.1 r1-s4 19.1 r3 19.1 r3-s1 19.1 r3-s2 19.2 19.2 r1 19.2 r1-s1 19.2 r1-s2 19.2 r1-s3 19.2 r1-s4 19.2 r2 19.3 19.3 r1 19.3 r1-s1 19.3 r2 19.3 r2-s1 19.3 r2-s2 19.3 r2-s3 19.3 r2-s4 19.4 19.4 r1 19.4 r1-s1 19.4 r1-s2 19.4 r2 19.4 r2-s1 19.4 r3 20.1 20.1 r1 20.1 r1-s1 20.1 r1-s2 20.1 r1-s3

Affected range stops below 15.1X49-D240, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.3R3-S10, so it looks safe — our inference, not a vendor statement

Affected range stops below 17.4R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.1R3-S10, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.2R2-S7, 18.2R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.3R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.4R1-S8, 18.4R2-S6, 18.4R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.1R1-S5, 19.1R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.2R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.3R2-S5, 19.3R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.4R2-S2, 19.4R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.1R1-S4, 20.1R2, so it looks safe — our inference, not a vendor statement

juniper-srx1500 (environment) · juniper-srx300 (environment) · juniper-srx320 (environment) · juniper-srx340 (environment) · juniper-srx345 (environment) · juniper-srx380 (environment) · juniper-srx4100 (environment) · juniper-srx4200 (environment) · juniper-srx4600 (environment) · juniper-srx5400 (environment) · juniper-srx550 (environment) · juniper-srx5600 (environment) · juniper-srx5800 (environment)

Junos OS Evolved · Juniper Networks

60%

19.3 ≤ v < 19.3R2-S5-EVO19.4 ≤ v < 19.4R2-S2-EVO20.1 ≤ v < 20.1R1-S4-EVO19.3 19.4 20.1

Affected range stops below 19.3R2-S5-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.4R2-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.1R1-S4-EVO, so it looks safe — our inference, not a vendor statement

Srx1500 · Juniperdevice

80%

All versions

Srx300 · Juniperdevice

80%

All versions