Root remote command execution on widely deployed Juniper EX/SRX/QFX network devices via rogue DHCP — can disrupt enterprise network infrastructure.
CVE-2026-102059
Root RCE via rogue DHCP in Juniper Junos phcd on EX/SRX/QFX
Is CVE-2026-102059 being exploited?
Not confirmed. CVE-2026-102059 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 3.9% probability of exploitation in the next 30 days.
How severe is CVE-2026-102059?
CVE-2026-102059 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-2026-102059?
Yes. A fix has been recorded for CVE-2026-102059. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-102059 affect?
CVE-2026-102059 affects Juniper Junos OS, Junos OS Evolved, EX Series, SRX Series, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102059?
Apply Juniper advisory update (JSA112187) immediately; block/limit unauthorized DHCP and isolate affected devices.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Adjacent unauthenticated attacker can execute arbitrary commands as root via a rogue DHCP server, enabling full device compromise and network control.
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.