VulnSocial

CVE-2026-67191Disclosure

LOWCVSS 9.3 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Xlight FTP Server before 3.9.5 contains a pre-authentication heap buffer overflow vulnerability that allows remote unauthenticated attackers to write past the end of a heap buffer by sending a malformed SSH client identification string. A logic error in the recv loop's termination condition uses an incorrect OR operator where an AND operator is required, enabling exploitation on any SSH or SFTP connection before authentication occurs.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • Peaked 1d ago at 2 mentions (2026-07-29); latest day: 1
  • 3 total mentions across 2 days

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-07-29: 2Mentions · 2026-08-05: 1Technical Details · 2026-07-29: 2Technical Details · 2026-08-05: 107-2908-05
Signal classification1 categories
Disclosure
3100.0%
Referenced assets5 URLs
Classification over time
DateTotalLabels
2026-07-292
Disclosure2
2026-08-051
Disclosure1
Full discourse3 posts
  • FOFA@fofabot
    Disclosure

    ⚠️⚠️ CVE-2026-67191 (CVSS 9.8) + CVE-2026-67192 (CVSS 9.2): Pre-authentication buffer overflows in Xlight FTP Server allow unauthenticated RCE via malformed SSH packets before any login occurs 🔗FOFA Link: https://en.fofa.info/result?qbase64=YXBwPSJYbGlnaHQtRlRQIg%3D%3D 🎯60.5K+ Results are found on http://en.fofa.info in the past year. FOFA Query: app="Xlight-FTP" 🔖Refer: https://www.vulncheck.com/advisories/xlight-ftp-server-pre-auth-heap-buffer-overflow-via-ssh-parser #OSINT #FOFA #CyberSecurity #Vulnerability

    Post summary

    The notice announces that CVE-2026-67191 and CVE-2026-67192 are pre‑authentication buffer overflows in Xlight FTP Server, enabling unauthenticated remote code execution via malicious SSH packets, without any PoC, exploit code, active exploitation, or patch information.

    19022105.1K
    14.8K followersView on X
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-67191 Xlight FTP Server before 3.9.5 contains a pre-authentication heap buffer overflow vulnerability that allows remote unauthenticated attackers to write past the end of … https://www.cve.org/CVERecord?id=CVE-2026-67191 ----- Traducción: CVE-2026-67191 Xli… http://infoflow.cloud`

    Post summary

    The tweet announces the discovery of CVE‑2026‑67191, a pre‑authentication heap buffer overflow in Xlight FTP Server 3.9.5‑older versions, with a link to the official CVE record.

    0000034
    96 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-67191 Xlight FTP Server before 3.9.5 contains a pre-authentication heap buffer overflow vulnerability that allows remote unauthenticated attackers to write past the end of … https://www.cve.org/CVERecord?id=CVE-2026-67191

    Post summary

    The text discloses a pre‑authentication heap buffer overflow in Xlight FTP Server that permits remote unauthenticated write beyond buffer limits, but offers no PoC, exploitation evidence, or patch information.

    00000503
    57.9K followersView on X

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