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Description

An Improper Handling of Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated network-based attacker sending a specific ICMP packet through a GRE tunnel to cause the PFE to crash and restart. When PowerMode IPsec (PMI) and GRE performance acceleration are enabled and the device receives a specific ICMP packet, a crash occurs in the SRX PFE, resulting in traffic loss. PMI is enabled by default, and GRE performance acceleration can be enabled by running the configuration command shown below. PMI is a mode of operation that provides IPsec performance improvements using Vector Packet Processing. Note that PMI with GRE performance acceleration is only supported on specific SRX platforms. This issue affects Junos OS on the SRX Series: * all versions before 21.4R3-S12, * from 22.4 before 22.4R3-S8, * from 23.2 before 23.2R2-S5, * from 23.4 before 23.4R2-S5, * from 24.2 before 24.2R2-S3, * from 24.4 before 24.4R2-S1, * from 25.2 before 25.2R1-S1, 25.2R2.

PUBLISHED Reserved 2026-01-05 | Published 2026-01-15 | Updated 2026-01-16 | Assigner juniper




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Red

Problem types

CWE-755 Improper Handling of Exceptional Conditions

Product status

Default status
unaffected

Any version before 21.4R3-S12
affected

22.4 (semver) before 22.4R3-S8
affected

23.2 (semver) before 23.2R2-S5
affected

23.4 (semver) before 23.4R2-S5
affected

24.2 (semver) before 24.2R2-S3
affected

24.4 (semver) before 24.4R2-S1
affected

25.2 (semver) before 25.2R1-S1, 25.2R2
affected

References

supportportal.juniper.net/JSA106005 vendor-advisory

www.juniper.net/...pic-map/security-powermode-ipsec-vpn.html technical-description

kb.juniper.net/JSA106005 vendor-advisory

cve.org (CVE-2026-21906)

nvd.nist.gov (CVE-2026-21906)

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