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

State: Published
Severity: 5.3 Medium
Published: Oct 14, 2026
Updated: Oct 16, 2026
Reserved: Sep 28, 2026

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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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS: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	juniper
3.1	5.4 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	juniper

Weaknesses

CWE-191 Integer Underflow (Wrap or Wraparound)

Affected Products

Product	Versions
Junos OSJuniper Networks	before 23.2R2-S7.7Affected 23.4 to before 23.4R2-S8.13Affected 24.2 to before 24.2R2-S5.5Affected 24.4 to before 24.4R2-S5Affected 25.2 to before 25.2R2-S2Affected 25.4 to before 25.4R1-S3Affected 26.2 to before 26.2R1-S2Affected
Junos OS EvolvedJuniper Networks	before 23.2R2-S7.7-EVOAffected 23.4 to before 23.4R2-S8.11-EVOAffected 24.2 to before 24.2R2-S5.6-EVOAffected 24.4 to before 24.4R2-S5-EVOAffected 25.2 to before 25.2R2-S2-EVOAffected 25.4 to before 25.4R1-S3-EVOAffected 26.2 to before 26.2R1-S2-EVOAffected 23.4X100Affected 25.2X100 to before 25.2X100-D35-EVOAffected 25.4X300 to before 25.4X300-D40-EVOAffected

References

https://supportportal.juniper.net/JSA112187vendor-advisory

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