Unauthenticated remote root RCE in Juniper SRX firewall OS affecting widely deployed network edge devices; high-impact and newsworthy.
CVE-2026-33792
Unauthenticated RCE in Juniper SRX srxpfe via crafted GRE packet.
Is CVE-2026-33792 being exploited?
Not confirmed. CVE-2026-33792 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 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-33792?
CVE-2026-33792 is rated Critical with a CVSS score of 9.3. 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-2026-33792?
Yes. A fix has been recorded for CVE-2026-33792. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33792 affect?
CVE-2026-33792 affects Juniper Junos OS on SRX Series (srxpfe process), SRX Series with configured GRE tunnels. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33792?
Apply Juniper advisory JSA112186; block GRE from untrusted networks until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can send crafted GRE packets to trigger a stack buffer overflow in srxpfe, achieving root RCE or causing DoS on SRX devices.
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.