CVE-2025-44879Public exploitNetwork attack vector

Service crash via unbounded Content-Length allocation

Published May 14, 2025 · Updated May 15, 2025

Unbounded heap allocation in WINSTAR WN572HP3 firmware 230525 allows remote attackers to crash upload.cgi via a crafted HTTP request. The CGI parses CONTENT_LENGTH with strtoll, adds one, and passes the unchecked result to malloc, after which execution crashes. The published demonstration uses a token-prefixed cookie and patches a conditional branch during emulation, leaving stock-device reachability unverified.

CVSS severity7.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unbounded heap allocation in WINSTAR WN572HP3 firmware 230525 allows remote attackers to crash upload.cgi via a crafted HTTP request. The CGI parses CONTENT_LENGTH with strtoll, adds one, and passes the unchecked result to malloc, after which execution crashes. The published demonstration uses a token-prefixed cookie and patches a conditional branch during emulation, leaving stock-device reachability unverified.

The record

CVE
CVE-2025-44879
Published
May 14, 2025
Updated
May 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 exploitPublished

Weakness, pattern, technique

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

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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