Denial of Service Vulnerability in Juniper Networks Junos OS and Junos OS Evolved
CVE-2026-33797

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Junos Os Evolved
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists

What is CVE-2026-33797?

An improper input validation vulnerability exists in Juniper Networks Junos OS and Junos OS Evolved. This flaw allows an unauthenticated, adjacent attacker to send a specific legitimate BGP packet within an established BGP session, resulting in the potential reset of that session. Repeated exploitation can lead to a sustained Denial of Service (DoS), impacting both eBGP and iBGP operations over IPv4 and IPv6 networks. It is essential for users of affected versions to apply necessary patches to mitigate risks.

Affected Version(s)

Junos OS 25.2 < 25.2R2

Junos OS Evolved 25.2 < 25.2R2-EVO

Junos OS 0 < 25.2R1

References

https://kb.juniper.net/JSA107850
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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