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CVE-2026-101968

Junos OS and Junos OS Evolved: EX Series, MX Series, ACX Series: An attacker causes rpd heap memory disclosure when Rosen-MVPN data-MDT is enabled

Description

An Integer Underflow (Wrap or Wraparound) vulnerability in the rpd process of Juniper Networks Junos OS on EX Series and MX Series, and Junos OS Evolved on ACX Series allows an unauthenticated adjacent attacker to cause heap memory disclosure and multicast join-state injection via a malformed Rosen-MVPN message. This issue only affects platforms that support draft Rosen MVPN, such as the ACX Series, EX Series, and MX Series.

Timeline

  1. ID reserved

    By juniper

  2. · 16 days later

    Published

  3. · 2 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-2026-101968, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)4.0Medium5.3CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/AU:Y/R:A/V:C/RE:M
juniperCNA (assigner)3.1Medium5.4CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVDNVD · Awaiting Analysis4.0Medium5.3CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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:Y/R:A/V:C/RE:M/U:X
EPSS (exploitation in 30 days)
0.24% · top 84% of all CVEs (11 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: Medium 5.3.

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: 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 .