CVE-2026-96676Public exploitNetwork attack vector

Remote stack overflow via unchecked alias copy

Published Sep 23, 2026 · Updated Sep 23, 2026

Stack-based buffer overflow in FAST FAC1900R 20190827_2.0.2 allows remote attackers to corrupt memory via a crafted HTTP POST request. The get_alias_name function in uhttpd uses memcpy to copy the user-controlled cloud_config.info.alias JSON string into a stack buffer without checking its upper bound. The request reaches the router remotely and overwrites uhttpd stack memory; no specific code-execution or crash outcome has been published.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in FAST FAC1900R 20190827_2.0.2 allows remote attackers to corrupt memory via a crafted HTTP POST request. The get_alias_name function in uhttpd uses memcpy to copy the user-controlled cloud_config.info.alias JSON string into a stack buffer without checking its upper bound. The request reaches the router remotely and overwrites uhttpd stack memory; no specific code-execution or crash outcome has been published.

The record

CVE
CVE-2026-96676
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
FAST
Product
FAC1900R
Classifications
CWE-121, T1190
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20190827_2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

FAST · FAC1900Rversion=20190827_2.0.2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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