Affects Juniper Junos network OS DHCP client; can disrupt DHCP/relay/ZTP across enterprises and service providers.
CVE-2026-102057
Buffer overflow in Junos DHCP client (jdhcpd) allows DoS via crafted DHCP responses.
Is CVE-2026-102057 being exploited?
Not confirmed. CVE-2026-102057 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 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-102057?
CVE-2026-102057 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-2026-102057?
Not known from our data. No patch reference has been recorded for CVE-2026-102057, 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-2026-102057 affect?
CVE-2026-102057 affects Juniper Junos OS (jdhcpd DHCP client process), Juniper routers and switches running affected Junos builds. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102057?
Apply vendor mitigations, block untrusted DHCP servers, isolate management, and patch Junos when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated adjacent attacker can crash jdhcpd via crafted DHCP response, causing DHCP, relay and ZTP service denial-of-service.
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
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.