Junos OS: Stack-based buffer overflow in authd via malicious RADIUS response
Summary
A stack-based buffer overflow in the authd process of Juniper Junos OS allows an attacker who can influence a configured RADIUS server to crash authd or execute code with root privileges. The attack is triggered by a malicious RADIUS response. Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
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
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 later releases
Workaround
- No known workarounds according to the Juniper CVE record. Check the Juniper advisory JSA112188 for updates.
Exploitation
- Juniper SIRT is not aware of any malicious exploitation.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Check whether any Junos device runs an affected release and uses RADIUS authentication, especially subscriber or AAA RADIUS (show configuration).
- Update affected devices to a fixed release from Juniper advisory JSA112188. Apply the whole advisory, as it contains further issues.
- Restrict who can reach the RADIUS path and protect the RADIUS server and its traffic on a separate network segment.
- Restrict management access to the devices and monitor authentication logs for anomalies.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Juniper Security Advisory JSA112188 supportportal.juniper.net
- OpenCVE: CVE-2026-102014 app.opencve.io
- Strix: CVE-2026-102014 www.strix.ai
- Positive Technologies PT-2026-113855 vulners.com
- Tenable plugin for JSA112188 www.tenable.com
- VulDB: 420197 vuldb.com
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, 03:27.
Original description (NVD)
A Stack-based Buffer Overflow vulnerability in the authd process of Juniper Networks Junos OS allows an attacker able to influence a configured RADIUS server to cause authd to crash or execute code with root privileges via a malicious RADIUS response.
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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