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CVE-2026-101972Junos OS and Junos OS Evolved: Malformed OSPF packets causes routing disruption when OSPF is enabled

Description

An Integer Overflow or Wraparound vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a denial of service via specific OSPFv2 packets sent on an OSPF-enabled interface.

Timeline

  1. ID reserved

    By juniper

  2. · 16 days later

    Published

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-2026-101972, 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
juniperCNA (assigner)3.1Medium6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Awaiting Analysis4.0High7.1CVSS: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:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.27% · top 81% of all CVEs (13 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 < 23.2R2-S7.7
    • affected 23.4 – < 23.4R2-S8.13
    • affected 24.2 – < 24.2R2-S5.5
    • affected 24.4 – < 24.4R2-S5
    • affected 25.2 – < 25.2R2-S2
    • affected 25.4 – < 25.4R1-S3
    • affected 26.2 – < 26.2R1-S2

  • Juniper Networks · Junos OS Evolved

    • affected < 23.2R2-S7.7-EVO
    • affected 23.4 – < 23.4R2-S8.11-EVO
    • affected 24.2 – < 24.2R2-S5.6-EVO
    • affected 24.4 – < 24.4R2-S5-EVO
    • affected 25.2 – < 25.2R2-S2-EVO
    • affected 25.4 – < 25.4R1-S3-EVO
    • affected 26.2 – < 26.2R1-S2-EVO
    • affected 23.4X100
    • affected 25.2X100 – < 25.2X100-D35-EVO
    • affected 25.4X300 – < 25.4X300-D40-EVO

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 25.4R2, 26.2R1-S2, 26.2R2, 26.4R1, and all subsequent releases. Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases. Note: For Junos OS releases 23.2, 23.4, and 24.2, and Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

Workaround: If OSPF packet processing on an enabled interface isn't needed, but it has just been configured so that it's added to the LSDB, ensure it's configured as 'passive': [ protocols ospf area <area> interface <interface> passive ]

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 .