Paper/Archive/CVE-2026-101980

CVE-2026-101980

Juniper Networks Junos OS — Junos OS: Malformed Extended Echo requests cause a Routing Engine reboot when Extended Echo is enabled

EPSS 0.5%CVSS 9.8

critical.is priorityof 100

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 40.7.407 × 208.1 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

An Integer Underflow vulnerability in the kernel of Juniper Networks Junos OS with Extended Echo configured allows an unauthenticated, network-based attacker to cause a denial of service by a kernel crash.

Affected

ProductAffectedFixed inSource

Junos OS< 23.2R2-S7.723.2R2-S7.7CNA

Junos OS23.4 – < 23.4R2-S8.1323.4R2-S8.13CNA

Junos OS24.2 – < 24.2R2-S5.524.2R2-S5.5CNA

Junos OS24.4 – < 24.4R2-S524.4R2-S5CNA

Junos OS25.2 – < 25.2R2-S225.2R2-S2CNA

Junos OS25.4 – < 25.4R1-S325.4R1-S3CNA

Junos OS26.2 – < 26.2R1-S226.2R1-S2CNA

Scores by source

juniper (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

juniper (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

advisorysupportportal.juniper.net/JSA112188