CVE-2026-101938

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Integer Underflow in Juniper Networks Junos OS SRX Series

Publication date: 2026-10-14

Last updated on: 2026-10-14

Assigner: Juniper Networks, Inc.

Description

An Integer Underflow (Wrap or Wraparound) vulnerability in the srxpfe of Juniper Networks Junos OS and Junos OS Evolved on the SRX Series allows an adjacent unauthenticated attacker to cause a forwarding-plane denial of service via an ICMP message associated with an SVR carrier session.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-14

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-101938

EUVD

EUVD-2026-101490

Affected Vendors & Products

Vendor	Product	Version / Range
Juniper	Networks	Junos OS 0
Juniper	Networks	Junos OS 23.4
Juniper	Networks	Junos OS 24.2
Juniper	Networks	Junos OS 24.4
Juniper	Networks	Junos OS 25.2
Juniper	Networks	Junos OS 25.4
Juniper	Networks	Junos OS 26.2
Juniper	Networks	Junos OS Evolved 0
Juniper	Networks	Junos OS Evolved 23.4
Juniper	Networks	Junos OS Evolved 24.2
Juniper	Networks	Junos OS Evolved 24.4
Juniper	Networks	Junos OS Evolved 25.2
Juniper	Networks	Junos OS Evolved 25.4
Juniper	Networks	Junos OS Evolved 26.2
Juniper	Networks	Junos OS Evolved 23.4X100
Juniper	Networks	Junos OS Evolved 25.2X100
Juniper	Networks	Junos OS Evolved 25.4X300

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-191	The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

Attack-Flow Graph

Executive Summary

This vulnerability is an Integer Underflow (Wrap or Wraparound) flaw in the srxpfe component of Juniper Networks Junos OS and Junos OS Evolved running on SRX Series devices. It allows an adjacent unauthenticated attacker to disrupt network traffic by sending a specially crafted ICMP message linked to an SVR carrier session, causing a denial of service on the forwarding plane.

Detection Guidance

Detection requires monitoring for abnormal ICMP traffic patterns or crashes in the srxpfe process on SRX Series devices. Juniper recommends checking logs for ICMP messages associated with SVR carrier sessions and verifying the integrity of the forwarding plane. Use 'show system processes extensive | match srxpfe' to check process health and 'show log messages | match ICMP' to inspect ICMP traffic.

Impact Analysis

If exploited, this vulnerability could cause network outages or degraded performance on affected Juniper SRX Series devices. It may lead to loss of connectivity, interrupted services, or reduced network reliability for users relying on these systems.

Compliance Impact

The vulnerability causes a forwarding-plane denial of service via ICMP messages, which could disrupt network availability. This may impact compliance with GDPR (availability principle) and HIPAA (security rule for integrity and availability) by compromising system uptime and data accessibility.

Mitigation Strategies

Apply the latest Junos OS or Junos OS Evolved security patches from Juniper Networks to address the Integer Underflow vulnerability in srxpfe. Monitor Juniper's security advisories for updates and consider disabling ICMP messages associated with SVR carrier sessions if not required.

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