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TI-2026-47515 Aliases CVE-2026-67192GHSA-pvvv-gmf8-6fw8

Xlight FTP Server < 3.9.5 Pre-Auth Stack Buffer Overflow via SSH GCM Cipher

Priority MEDIUM 44CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

Xlight FTP Server before 3.9.5 contains a pre-authentication stack buffer overflow vulnerability that allows unauthenticated attackers to corrupt stack memory by sending malformed SSH packets when a GCM cipher is negotiated. Attackers can craft packets with an unvalidated length field passed directly to the GCM decrypt function, overwriting the stack cookie and return address to potentially achieve remote code execution before any authentication occurs.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01025 63rd percentileScored 2026-11-07
Fix Fixed Xlight FTP Server (Xlight): 3.9.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
XlightXlight FTP Serverbefore 3.9.53.9.5Patch availableCNA
  • Xlight FTP Server VendorXlight Affected before 3.9.5 Fixed in 3.9.5 Patch available CNA

Remediation

  • Fix · CNA Xlight FTP Server (Xlight) Fixed in 3.9.5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Xlight FTP Server 3.9.5

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-47514 Xlight FTP Server < 3.9.5 Pre-Auth Heap Buffer Overflow via SSH ParserPriority MEDIUM 44
    • TI-2026-47516 Xlight FTP Server < 3.9.5 Information Disclosure via USER CommandPriority LOW 37
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67192
  2. 2026-10-03 Alias added: GHSA-pvvv-gmf8-6fw8

References

Other 1

  • TI-2026-47514 Xlight FTP Server < 3.9.5 Pre-Auth Heap Buffer Overflow via SSH Parser CVSS 4.0CRITICAL 9.3
  • TI-2026-47516 Xlight FTP Server < 3.9.5 Information Disclosure via USER Command CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences