Junos OS SRX Series: Stack-based buffer overflow in iked VPN daemon
Summary
Junos OS on Juniper SRX Series devices contains a stack-based buffer overflow (CWE-121) in the iked IKE key-management daemon. An authenticated remote-access VPN client can exploit it via the VPN authentication and JIMS identity-publishing path to execute code with root privileges or cause a denial of service. The issue applies only when JIMS identity publishing is enabled. The CVSS 4.0 base score is 8.7 (High).
Affected
- Junos OS 0 to before 23.2R2-S7.7
- Junos OS 23.4 to before 23.4R2-S8.13
- Junos OS 24.2 to before 24.2R2-S5.5
- Junos OS 24.4 to before 24.4R2-S5
- Junos OS 25.2 to before 25.2R2-S2
- Junos OS 25.4 to before 25.4R1-S3
- Junos OS 26.2 to before 26.2R1-S2
- Default configuration: not affected (according to the CNA record)
Fixed in
- Junos OS 23.2R2-S7.7
- Junos OS 23.4R2-S8.13
- Junos OS 24.2R2-S5.5
- Junos OS 24.4R2-S5
- Junos OS 25.2R2-S2
- Junos OS 25.4R1-S3 or 25.4R2
- Junos OS 26.2R1-S2 or 26.2R2
- Junos OS 26.4R1 and all subsequent releases
Source: Juniper CNA record. Verify in JSA112186 before upgrading.
Workaround
Unknown. The CNA record states there are no known workarounds.
- Limit which users and networks can reach the remote-access VPN service.
- Review whether JIMS identity publishing is required.
Exploitation
- Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
Our recommendation
- Inventory all SRX devices and compare their Junos OS versions with the fixed releases in JSA112186.
- Check whether remote-access VPN with JIMS identity publishing is configured.
- Upgrade affected devices to a fixed release, prioritising internet-facing systems.
- Review VPN accounts while the patch is pending: remove stale accounts and enforce MFA where supported.
- Review the other SRX issues in the same advisory JSA112186.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Juniper Security Advisory JSA112186 supportportal.juniper.net
- OpenCVE record CVE-2026-102174 app.opencve.io
- threatint CVE record CVE-2026-102174 cve.threatint.com
- VulDB entry 420182 vuldb.com
- SecurityOnline: Juniper patches Junos OS vulnerabilities securityonline.info
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 03:06.
Original description (NVD)
A Stack-based Buffer Overflow vulnerability in the iked IKE key-management daemon of Juniper Networks Junos OS on the SRX Series allows an authenticated remote-access VPN client to execute code with root privileges or cause denial of service via the remote-access VPN authentication and JIMS identity-publishing path.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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