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7.5

Juniper Junos OS may ignore firewall filter after reboot

CVE-2018-0026 · published 8 years ago
Summary

Juniper Junos OS devices running versions 15.1R4‑R6 or early 15.1X8 may not apply stateless firewall filters after a reboot or software upgrade. This means traffic may pass without the intended filtering, leaving the network less protected. Upgrade to a later release or apply the recommended fix from Juniper to ensure filters are loaded correctly.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
juniper junos 15.1
15.1x8
cpe:2.3:o:juniper:junos:15.1:r4:*:*:*:*:*:*
Original advisory text
After Junos OS device reboot or upgrade, the stateless firewall filter configuration may not take effect. This issue can be verified by running the command: user@re0> show interfaces <interface_nam...
After Junos OS device reboot or upgrade, the stateless firewall filter configuration may not take effect. This issue can be verified by running the command: user@re0> show interfaces <interface_name> extensive | match filters" CAM destination filters: 0, CAM source filters: 0 Note: when the issue occurs, it does not show the applied firewall filter. The correct output should show the applied firewall filter, for example: user@re0> show interfaces <interface_name> extensive | match filters" CAM destination filters: 0, CAM source filters: 0 Input Filters: FIREWAL_FILTER_NAME-<interface_name> This issue affects firewall filters for every address family. Affected releases are Juniper Networks Junos OS: 15.1R4, 15.1R5, 15.1R6 and SRs based on these MRs. 15.1X8 versions prior to 15.1X8.3.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker partial control (estimated)
Severity
7.5 High
Exploitation
2% chance of attack within 30 days
Timeline
Published11 Jul 2018
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2018-0026 · NVD
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