Advisory severityMedium6.5Juniper Networks

Medium [CVE-2026-102021] Junos OS and Junos OS Evolved: Malformed RSVP packet causes rpd crash when MPLS-TE error processing is enabled

This medium-severity Juniper Networks advisory covers CVE-2026-102021 affecting Junos OS, Junos OS Evolved.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-102021 Source published Oct 15, 2026Source updated Oct 15, 2026

VulniPulse record published Oct 15, 2026Record updated Oct 15, 2026

CVE-2026-102021

Affected products & platforms

Juniper NetworksJunosJunos OS Evolved

Open source advisory

Android app · Google Play

Monitor future Juniper Networks CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

A NULL Pointer Dereference vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent network attacker to cause a denial of service via a crafted RSVP packet when MPLS-TE RSVP processing is enabled. The condition can terminate rpd and disrupt routing protocol sessions.

Affected versions

Junos OS 24.4 before 24.4R2-S5
Junos OS 25.2 before 25.2R2-S2
Junos OS 25.4 before 25.4R1-S3
Junos OS 26.2 before 26.2R1-S2
Junos OS Evolved 24.4 before 24.4R2-S5-EVO
Junos OS Evolved 25.2 before 25.2R2-S2-EVO
Junos OS Evolved 25.4 before 25.4R1-S3-EVO
Junos OS Evolved 26.2 before 26.2R1-S2-EVO
Junos OS Evolved 25.2X100 before 25.2X100-D35-EVO
Junos OS Evolved 25.4X300 before 25.4X300-D40-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions

24.4R2-S5
25.2R2-S2
25.4R1-S3
26.2R1-S2
24.4R2-S5-EVO
25.2R2-S2-EVO
25.4R1-S3-EVO
26.2R1-S2-EVO
25.2X100-D35-EVO
25.4X300-D40-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 26.2R1-S2, 24.4R2-S5-EVO, 25.2R2-S2-EVO. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Juniper Networks
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-102021 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-102021NVD CVE.org MITRE

Official resources

Junos OS software downloads & install/upgrade (target: 24.4R2-S5 / 25.2R2-S2 / 25.4R1-S3)
Official documentation
This advisory names 24.4R2-S5 / 25.2R2-S2 / 25.4R1-S3 as the first fixed releases — official upgrade documentation for Junos OS on SRX / MX / EX / QFX.
Junos OS release & EOL / support dates
Release notes
Confirm your train is still supported and pick a fixed maintenance release.
Juniper Security Advisories portal
Official documentation
Canonical Juniper SIRT advisory portal — search here for the full JSA text and revisions.

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.