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Multiple Vulnerabilities in Juniper Junos OS

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Junos OS Evolved on PTX Series: 

all versions before 22.4R3-S9-EVO

23.2 versions before 23.2R2-S6-EVO

23.4 versions before 23.4R2-S7-EVO

24.2 versions before 24.2R2-S4-EVO

24.4 versions before 24.4R2-S2-EVO

25.2 versions before 25.2R1-S2-EVO, 25.2R2-EVO.

Junos OS:

all versions before 22.4R3-S1

23.2 versions before 23.2R2

23.4 versions before 23.4R2.

Overview

Multiple vulnerabilities have been reported in Juniper Junos OS which could allow an attacker to gain elevated privileges or cause denial-of-service (DoS) on the targeted system.

Target Audience:

All end-user organizations and individuals using Juniper Junos OS.

Risk Assessment:

High risk of data manipulation and service disruption.

Impact Assessment:

Potential impact on confidentiality, integrity, and availability of the system.

Description

Juniper Junos OS is a network operating system used in Juniper Networks routers, switches, and security devices.

These vulnerabilities exist in Juniper Junos OS due to an incorrect argument type handling in the sensor interface of Junos OS Evolved on PTX Series devices and improper memory management (failure to release memory after use) in the jdhcpd daemon on Junos OS (MX Series). A remote attacker could exploit these vulnerabilities by persuading a specially crafted request to gain elevated privileges on the targeted system.

Successful exploitation of these vulnerabilities could allow an unauthenticated attacker to gain elevated privileges or cause denial-of-service (DoS) on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor

Vendor Information

Juniper Junos OS

https://supportportal.juniper.net/s/article/2026-04-Security-Bulletin-Junos-OS-Evolved-PTX-Series-If-SRTE-tunnels-provisioned-via-PCEP-are-present-and-specific-gRPC-queries-are-received-evo-aftman-crashes-CVE-2026-33783

References

Juniper Junos OS

https://supportportal.juniper.net/s/article/2026-04-Security-Bulletin-Junos-OS-Evolved-PTX-Series-If-SRTE-tunnels-provisioned-via-PCEP-are-present-and-specific-gRPC-queries-are-received-evo-aftman-crashes-CVE-2026-33783

CVE Name

CVE-2026-33782

CVE-2026-33783

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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