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TI-2026-26173 Aliases CVE-2026-33801GHSA-cv9f-44gv-7rg6

Junos OS and Junos OS Evolved: When a specifically malformed BGP route update is received RPD crashes

Priority LOW 31CWE-754Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker sending a specific BGP update over an established BGP session to cause a Denial-of-Service (DoS). Upon receipt of a specifically malformed non-inet/inet6 unicast BGP update, an RPD crash and restart is triggered, which will cause a complete service outage until routing has reconverged. The rpd crash occurs before the update can be readvertised, so there is no downstream propagation. This issue affects: * Junos OS versions 25.2 before 25.2R2; * Junos OS Evolved versions 25.2 before 25.2R2-EVO. This issue doesn't affect Junos OS versions before 25.2R1 nor Junos OS Evolved versions before 25.2R1-EVO.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00281 20th percentileScored 2026-11-07
Fix Fixed Junos OS (Juniper Networks): 25.2R2Junos OS Evolved (Juniper Networks): 25.2R2-EVO

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
JuniperJunos OS25.2 to before 25.2R225.2R2Patch availableCNA
JuniperJunos OS Evolved25.2 to before 25.2R2-EVO25.2R2-EVOPatch availableCNA
  • Junos OS VendorJuniper Affected 25.2 to before 25.2R2 Fixed in 25.2R2 Patch available CNA
  • Junos OS Evolved VendorJuniper Affected 25.2 to before 25.2R2-EVO Fixed in 25.2R2-EVO Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*25.2VulnerableJuniper
cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*25.2 r1VulnerableJuniper
cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*25.2 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:*25.2 r1-s2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:*25.2VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:*25.2 r1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:*25.2 r1-s1VulnerableJuniper
cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:*25.2 r1-s2VulnerableJuniper
  • cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:* Versions 25.2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:* Versions 25.2 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:* Versions 25.2 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:* Versions 25.2 r1-s2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:* Versions 25.2 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:* Versions 25.2 r1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:* Versions 25.2 r1-s1 Vulnerable ·Juniper
  • cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:* Versions 25.2 r1-s2 Vulnerable ·Juniper

Remediation

  • Fix · CNA Junos OS (Juniper Networks) Fixed in 25.2R2
  • Fix · CNA Junos OS Evolved (Juniper Networks) Fixed in 25.2R2-EVO

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33801
  2. 2026-10-03 Alias added: GHSA-cv9f-44gv-7rg6

References

Advisory 1

  • TI-2023-18638 Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-01585 Out of Cycle Security Advisory: Junos OS: Security vulnerability in J-Web and web based (HTTP/HTTPS) services KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-04610 Assertion failure in ISC BIND named via TKEY queries KEVCVSS 3.1HIGH 7.5
  • TI-2025-15550 Junos OS: An local attacker with shell access can execute arbitrary code KEVCVSS 4.0MEDIUM 6.7
  • TI-2023-18644 Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload and download arbitrary files KEVCVSS 3.1MEDIUM 5.3
  • TI-2023-18640 Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary files KEVCVSS 3.1MEDIUM 5.3
See all 792 →

Sources

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