Affects Juniper Junos OS (widely used network OS). Root RCE/DoS in network control process can disrupt enterprise and carrier infrastructure.
CVE-2026-102049
Buffer overflow in Junos l2cpd via LLDP allows root RCE or DoS.
Is CVE-2026-102049 being exploited?
Not confirmed. CVE-2026-102049 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-102049?
CVE-2026-102049 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-102049?
Not known from our data. No patch reference has been recorded for CVE-2026-102049, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-102049 affect?
CVE-2026-102049 affects Juniper Junos OS, Juniper Junos OS Evolved, l2cpd process, Interfaces with Unified Access Policy (UAP). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102049?
Apply vendor advisory, restrict/block LLDP on untrusted ports, and patch when vendor fixes available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Adjacent unauthenticated attacker can send crafted LLDP to UAP-enabled interface to crash l2cpd or achieve arbitrary code execution as root.
Immediate action required
- affected< 23.2R2-S7.7
- affected>= 23.4 and < 23.4R2-S8.13
- affected>= 24.2 and < 24.2R2-S5.5
- affected>= 24.4 and < 24.4R2-S5
- affected>= 25.2 and < 25.2R2-S2
- affected>= 25.4 and < 25.4R1-S3
- affected>= 26.2 and < 26.2R1-S2
- affected< 23.2R2-S7.7-EVO
- affected>= 23.4 and < 23.4R2-S8.11-EVO
- affected>= 24.2 and < 24.2R2-S5.6-EVO
- affected>= 24.4 and < 24.4R2-S5-EVO
- affected>= 25.2 and < 25.2R2-S2-EVO
- affected>= 25.4 and < 25.4R1-S3-EVO
- affected>= 26.2 and < 26.2R1-S2-EVO
- affected23.4X100
- affected>= 25.2X100 and < 25.2X100-D35-EVO
- affected>= 25.4X300 and < 25.4X300-D40-EVO
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.