CVE-2023-37793Public exploitNetwork attack vector

Service crash via oversized upgrade filter path

Published Jul 14, 2023 · Updated Oct 30, 2024

Buffer overflow in /upgrade_filter.asp in WayOS FBM-291W 19.09.11V allows remote authenticated users to crash the router. The handler accepts a path form value containing a 4,096-byte string and copies it without an adequate length check, overflowing memory. The published request supplies root session cookies; its demonstrated consequence is a router crash, while root-shell execution is asserted but not demonstrated.

CVSS severity9.8
Critical
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in /upgrade_filter.asp in WayOS FBM-291W 19.09.11V allows remote authenticated users to crash the router. The handler accepts a path form value containing a 4,096-byte string and copies it without an adequate length check, overflowing memory. The published request supplies root session cookies; its demonstrated consequence is a router crash, while root-shell execution is asserted but not demonstrated.

The record

CVE
CVE-2023-37793
Published
Jul 14, 2023
Updated
Oct 30, 2024
Vendor
Shenzhen WayOS Technology Co., Ltd.
Product
FBM-291W
Classifications
CWE-120, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record 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=19.09.11V

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen WayOS Technology Co., Ltd. · FBM-291Wversion=19.09.11V

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

Public exploit references

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Technologies

Your stack

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Your stack

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