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Vulnerability details

CVE-2026-102084

Juniper Networks Junos OS

Junos OS: SRX Series: In an ADVPN scenario a malformed message from a peer causes Remote Code Execution

CVSS 4.0
9.2Critical

Official description

An Improper Validation of Syntactic Correctness of Input vulnerability in the VPN daemon of Juniper Networks Junos OS on SRX Series allows an authenticated, network-based attacker to take complete control of the device. If an SRX device configured for AutoDiscovery VPN (ADVPN) receives a message from a peer that contains one or more specifically malformed attributes, this will cause a buffer overflow, which can allow remote code execution and therefore allow an attacker to take complete control of the device. To be able to carry out this attack an attacker must either have acquired the shared secret to impersonate a peer or have compromised an existing one, so this attack is considerably difficult. This issue affects Junos OS on SRX Series: * All versions before 23.2R2-S7.7; * from 23.4 before 23.4R2-S7; * from 24.2 before 24.2R2-S4; * from 24.4 before 24.4R2-S3; * from 25.2 before 25.2R2; * from 25.4 before 25.4R1-S3.

CVSS scores

ScoreVersionSourceVector
9.2Critical 4.0 CVEProject cvelistV5 (CNA) (juniper) CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/RE:M
8.1High 3.1 CVEProject cvelistV5 (CNA) (juniper) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
Juniper Networks Junos OS v < 23.2R2-S7.7 CVEProject cvelistV5 (CNA)
Juniper Networks Junos OS 23.4 ≤ v < 23.4R2-S7 CVEProject cvelistV5 (CNA)
Juniper Networks Junos OS 24.2 ≤ v < 24.2R2-S4 CVEProject cvelistV5 (CNA)
Juniper Networks Junos OS 24.4 ≤ v < 24.4R2-S3 CVEProject cvelistV5 (CNA)
Juniper Networks Junos OS 25.2 ≤ v < 25.2R2 CVEProject cvelistV5 (CNA)
Juniper Networks Junos OS 25.4 ≤ v < 25.4R1-S3 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-10-14
Last updated
2026-10-15
State
Published
Assigner (CNA)
juniper
Kolun priority
25 · Low

Exploit prediction (EPSS)

0.5%
Probability of exploitation in 30 days
43.7%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-1286
    Improper Validation of Syntactic Correctness of Input