CVE-2023-35968Network attack vector

Heap corruption via unchecked realloc size

Published Oct 11, 2023 · Updated Nov 4, 2025

Heap-based buffer overflow in Yifan YF325 1.0_20221108 allows remote attackers to corrupt process memory via a crafted network request. The gwcfg_cgi_set_manage_post_data handler adds one to an unchecked Content-Length for realloc, creating an undersized POST_DATA buffer before wfread writes the declared body. Exploitation requires network access to a gwcfg.cgi/set* endpoint but no authentication or user interaction, and the overwrite can disrupt the router or alter httpd execution.

CVSS severity9.8
Critical
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Yifan YF325 1.0_20221108 allows remote attackers to corrupt process memory via a crafted network request. The gwcfg_cgi_set_manage_post_data handler adds one to an unchecked Content-Length for realloc, creating an undersized POST_DATA buffer before wfread writes the declared body. Exploitation requires network access to a gwcfg.cgi/set* endpoint but no authentication or user interaction, and the overwrite can disrupt the router or alter httpd execution.

The record

CVE
CVE-2023-35968
Published
Oct 11, 2023
Updated
Nov 4, 2025
Vendor
Xiamen Yifan Communication Technology Co., Ltd.
Product
YF325 Firmware
Classifications
CWE-787, CWE-190, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=1.0_20221108

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Xiamen Yifan Communication Technology Co., Ltd. · YF325 Firmwareversion=1.0_20221108
Xiamen Yifan Communication Technology Co., Ltd. · YF325version=v1.0_20221108

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8Cisco TalosCVSS: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-190Integer Overflow or Wraparound
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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