Improper Input Validation in Juniper Networks Junos OS SIP Plugin
CVE-2026-57026

8.7HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
9 July 2026

Badges

👾 Exploit Exists

What is CVE-2026-57026?

An Improper Validation of Syntactic Correctness of Input vulnerability in the SIP plugin of Juniper Networks Junos OS affects the MX Series with SPC3 and SRX Series. If the SIP ALG is enabled on an impacted device, processing a malformed SIP invite packet can cause a critical disruption. Specifically, it leads to a failure of the flow processing daemon (flowd), resulting in a crash and subsequent restart. This issue can cause a complete service outage, leaving systems vulnerable until automatic recovery occurs. Organizations should review their configurations and apply the necessary updates to mitigate this risk.

Affected Version(s)

Junos OS SRX Series 0 < 23.2R2-S7

Junos OS SRX Series 23.4 < 23.4R2-S8

Junos OS SRX Series 24.2 < 24.2R2-S5

References

https://supportportal.juniper.net/JSA110086
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
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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