Affects Juniper SRX Series (widely deployed network/firewall infrastructure); can cause complete service outage across networks, so broadly impactful to enterprises.
CVE-2026-102078
Use-after-free in Junos SRX pfe allows remote DoS via high-volume DNS when TCP web-filtering enabled.
Is CVE-2026-102078 being exploited?
Not confirmed. CVE-2026-102078 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-2026-102078?
CVE-2026-102078 is rated High with a CVSS score of 8.2. 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-2026-102078?
Yes. A fix has been recorded for CVE-2026-102078. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-102078 affect?
CVE-2026-102078 affects Juniper Junos OS on SRX Series, All versions before 23.2R2-S5, 23.4 before 23.4R2-S6, 24.2 before 24.2R2-S3, 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-2026-102078?
Install Juniper fixes immediately; if unable, disable TCP web-filtering or rate-limit DNS traffic.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated network DoS: attacker-triggered flowd crash/restart causing complete service outage when TCP web-filtering is configured.
Immediate action required
- affected< 23.2R2-S5
- affected>= 23.4 and < 23.4R2-S6
- affected>= 24.2 and < 24.2R2-S3
- affected>= 24.4 and < 24.4R2-S1
- affected>= 25.2 and < 25.2R1-S1, 25.2R2
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.