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CVE-2024-39558Junos OS and Junos OS Evolved: Receipt of specific PIM packet causes rpd crash when PIM is configured along with MoFRR

Description

An Unchecked Return Value vulnerability in the Routing Protocol Daemon (rpd) on Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows a logically adjacent, unauthenticated attacker sending a specific PIM packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS), when PIM is configured with Multicast-only Fast Reroute (MoFRR). Continued receipt and processing of this packet may create a sustained Denial of Service (DoS) condition. This issue is observed on Junos and Junos Evolved platforms where PIM is configured along with MoFRR. MoFRR tries to select the active path, but due to an internal timing issue, rpd is unable to select the forwarding next-hop towards the source, resulting in an rpd crash. This issue affects: Junos OS: * All versions before 20.4R3-S10, * 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, * from 22.4 before 22.4R2;  Junos OS Evolved: * All versions before 20.4R3-S10 -EVO, * All versions of 21.2-EVO, * from 21.4-EVO before 21.4R3-S9-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-EVO, * from 22.4-EVO before 22.4R2-EVO.

Timeline

  1. ID reserved

    By juniper

  2. · 15 days later

    Published

  3. · 34 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-39558, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)4.0High7.1CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A
juniperCNA (assigner)3.1Medium6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Analyzed4.0High7.1CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:A/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.26% · top 83% of all CVEs (15 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

  • Juniper Networks · Junos OS

    • affected < 20.4R3-S10
    • affected 21.2 – < 21.2R3-S7
    • affected 21.4 – < 21.4R3-S6
    • affected 22.1 – < 22.1R3-S5
    • affected 22.2 – < 22.2R3-S3
    • affected 22.3 – < 22.3R3
    • affected 22.4 – < 22.4R2

  • Juniper Networks · Junos OS Evolved

    • affected < 20.4R3-S10-EVO
    • affected 21.2R1-EVO – < 21.2*-EVO
    • affected 21.4-EVO – < 21.4R3-S9-EVO
    • affected 22.1-EVO – < 22.1R3-S5-EVO
    • affected 22.2-EVO – < 22.2R3-S3-EVO
    • affected 22.3-EVO – < 22.3R3-EVO
    • affected 22.4-EVO – < 22.4R2-EVO

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos: 20.4R3-S10, 21.2R3-S7, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3, 22.4R2, 23.2R1, and all subsequent releases. Junos OS Evolved: 20.4R3-S10-EVO, 21.4R3-S9-EVO, 22.1R3-S5-EVO, 22.2R3-S3-EVO, 22.3R3-EVO, 22.4R2-EVO, 23.2R1-EVO, and all subsequent releases.

Workaround: There are no known workarounds for this issue.

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

References

References1

Sources

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

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Record last updated .