Affects Juniper Junos, a widely deployed network OS; local exploit can escalate to root or cause network-device DoS, potentially disrupting enterprise and service provider infrastructure.
CVE-2026-101927
Heap overflow in Juniper eventd allows local DoS or root escalation
Is CVE-2026-101927 being exploited?
Not confirmed. CVE-2026-101927 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. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-101927?
CVE-2026-101927 is rated High with a CVSS score of 8.6. 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-2026-101927?
Not known from our data. No patch reference has been recorded for CVE-2026-101927, 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-2026-101927 affect?
CVE-2026-101927 affects Juniper Junos OS, Juniper Junos OS Evolved, All Juniper platforms running eventd. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101927?
Apply vendor fixes/mitigations ASAP and restrict local/admin access to affected devices
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unprivileged local attacker can send crafted IPC event messages to trigger a heap overflow, causing device DoS or escalate privileges to 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.