CVE-2026-33797Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset
Updated under an hour ago ()
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It affects Juniper Networks Junos OS and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker, sending a specific genuine BGP packet in an already established BGP session to reset only that session causing a Denial of Service (DoS). An attacker repeatedly sending the packet will sustain the Denial of Service (DoS).This issue affects Junos OS: * 25.2 versions before 25.2R2 This issue does not affect Junos OS versions before 25.2R1. This issue affects Junos OS Evolved: * 25.2-EVO versions before 25.2R2-EVO This issue does not affect Junos OS Evolved versions before 25.2R1-EVO. eBGP and iBGP are affected. IPv4 and IPv6 are affected.
- CVSS
- 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- juniper
- NVD analysis
- Modified
- Record last updated
- Apr 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Juniper Networks Junos OS juniper_networks:junos_os (from the name) | from 25.2 before 25.2R2; before 25.2R1 not affected | CNA record |
Juniper Networks Junos OS Evolved juniper_networks:junos_os_evolved (from the name) | from 25.2 before 25.2R2-EVO; before 25.2R1-EVO not affected | CNA record |
juniper junos juniper:junos | 25.2; 25.2; 25.2; 25.2 | NVD |
juniper junos_os_evolved juniper:junos_os_evolved | 25.2; 25.2; 25.2; 25.2 | NVD |
References
- https://kb.juniper.net/JSA107850vendor-advisory
- https://supportportal.juniper.net/JSA107850vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.