CVE-2024-39554

Junos OS and Junos OS Evolved: BGP multipath incremental calculation is resulting in an rpd crash

MEDIUM

5.9

CVSS Score

Published: July 10, 2024 at 10:32 PM UTC

Updated: June 17, 2026 at 07:42 AM UTC

3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

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Severity

MEDIUM5.9

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to inject incremental routing updates when BGP multipath is enabled, causing rpd to crash and restart, resulting in a Denial of Service (DoS). Since this is a timing issue (race condition), the successful exploitation of this vulnerability is outside the attacker's control. However, continued receipt and processing of this packet may create a sustained Denial of Service (DoS) condition. On all Junos OS and Junos OS Evolved platforms with BGP multipath enabled, a specific multipath calculation removes the original next hop from the multipath lead routes nexthop-set. When this change happens, multipath relies on certain internal timing to record the update. Under certain circumstance and with specific timing, this could result in an rpd crash. This issue only affects systems with BGP multipath enabled. This issue affects: Junos OS: * All versions of 21.1 * from 21.2 before 21.2R3-S7, * from 21.4 before 21.4R3-S6, * from 22.1 before 22.1R3-S5, * from 22.2 before 22.2R3-S3, * from 22.3 before 22.3R3-S2, * from 22.4 before 22.4R3, * from 23.2 before 23.2R2. Junos OS Evolved: * All versions of 21.1-EVO, * All versions of 21.2-EVO, * from 21.4-EVO before 21.4R3-S6-EVO, * from 22.1-EVO before 22.1R3-S5-EVO, * from 22.2-EVO before 22.2R3-S3-EVO, * from 22.3-EVO before 22.3R3-S2-EVO, * from 22.4-EVO before 22.4R3-EVO, * from 23.2-EVO before 23.2R2-EVO. Versions of Junos OS before 21.1R1 are unaffected by this vulnerability. Versions of Junos OS Evolved before 21.1R1-EVO are unaffected by this vulnerability.

Affected

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

Junos OS Evolved · Juniper

95%

v < 21.1r1-evo21.1 ≤ v < 21.321.1-evo ≤ v < 21.1*-evo21.2-evo ≤ v < 21.2*-evo21.4-evo ≤ v < 21.4r3-s6-evo22.1-evo ≤ v < 22.1r3-s5-evo22.2-evo ≤ v < 22.2r3-s3-evo22.3-evo ≤ v < 22.3r3-s2-evo22.4-evo ≤ v < 22.4r3-evo23.2-evo ≤ v < 23.2r2-evo21.1-evo21.2-evo21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4 r3-s3 21.4 r3-s4 21.4 r3-s521.4-evo22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.1 r2 22.1 r2-s1 22.1 r3 22.1 r3-s1 22.1 r3-s2 22.1 r3-s3 22.1 r3-s422.1-evo22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.2 r2 22.2 r2-s1 22.2 r2-s2 22.2 r3 22.2 r3-s1 22.2 r3-s222.2-evo22.3 22.3 r1 22.3 r1-s1 22.3 r1-s2 22.3 r2 22.3 r2-s1 22.3 r2-s2 22.3 r3 22.3 r3-s122.3-evo22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2 22.4 r2 22.4 r2-s1 22.4 r2-s222.4-evo23.2 23.2 r1 23.2 r1-s1 23.2 r1-s223.2-evo

Affected range stops below 21.1*-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1r1-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2*-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4r3-s6-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1r3-s5-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2r3-s3-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3r3-s2-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4r3-evo, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2r2-evo, so it looks safe — our inference, not a vendor statement

Junos · Juniper Networks

95%

v < 21.1r121.1 ≤ v < 21.1*21.1 ≤ v < 21.221.2 ≤ v < 21.2R3-S721.4 ≤ v < 21.4r3-s622.1 ≤ v < 22.1R3-S522.2 ≤ v < 22.2r3-s322.3 ≤ v < 22.3r3-s222.4 ≤ v < 22.4r323.2 ≤ v < 23.2R221.1 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.2 r3-s2 21.2 r3-s3 21.2 r3-s4 21.2 r3-s5 21.2 r3-s6 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4 r3-s3 21.4 r3-s4 21.4 r3-s5 22.1 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.1 r2 22.1 r2-s1 22.1 r2-s2 22.1 r3 22.1 r3-s1 22.1 r3-s2 22.1 r3-s3 22.1 r3-s4 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.2 r2 22.2 r2-s1 22.2 r2-s2 22.2 r3 22.2 r3-s1 22.2 r3-s2 22.3 22.3 r1 22.3 r1-s1 22.3 r1-s2 22.3 r2 22.3 r2-s1 22.3 r2-s2 22.3 r3 22.3 r3-s1 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2 22.4 r2 22.4 r2-s1 22.4 r2-s2 23.2 23.2 r1 23.2 r1-s1 23.2 r1-s2

Affected range stops below 21.1*, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 21.1R1 (unaffected)

Affected range stops below 21.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S7, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S5, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S2, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

21.1-EVO ≤ v < 21.1*-EVO21.2-EVO ≤ v < 21.2*-EVO21.4-EVO ≤ v < 21.4R3-S6-EVO22.1-EVO ≤ v < 22.1R3-S5-EVO22.2-EVO ≤ v < 22.2R3-S3-EVO22.3-EVO ≤ v < 22.3R3-S2-EVO22.4-EVO ≤ v < 22.4R3-EVO23.2-EVO ≤ v < 23.2R2-EVO21.1-EVO 21.2-EVO 21.4-EVO 22.1-EVO 22.2-EVO 22.3-EVO 22.4-EVO 23.2-EVO

Affected range stops below 21.1*-EVO, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 21.1R1-EVO (unaffected)

Affected range stops below 21.2*-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S6-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S5-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.2R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://supportportal.juniper.net/JSA83014

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA83014

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMjuniper

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-362

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