CVE-2025-57785Network attack vector

Heap corruption via show_index double-free

Published Jan 26, 2026 · Updated Jan 26, 2026

Double free in Hiawatha Webserver 11.7 allows remote attackers to corrupt heap data through an unauthenticated directory-index request. The XSLT-enabled show_index directory-listing path releases the same XML-generation allocation twice during erroneous processing. The host must use XSLT-backed directory indexes; the reported consequence is data corruption, with arbitrary code execution identified as a possible outcome.

CVSS severity6.5
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Hiawatha Webserver 11.7 allows remote attackers to corrupt heap data through an unauthenticated directory-index request. The XSLT-enabled show_index directory-listing path releases the same XML-generation allocation twice during erroneous processing. The host must use XSLT-backed directory indexes; the reported consequence is data corruption, with arbitrary code execution identified as a possible outcome.

The record

CVE
CVE-2025-57785
Published
Jan 26, 2026
Updated
Jan 26, 2026
Vendor
Hiawatha
Product
Hiawatha Webserver
Classifications
CWE-415, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 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=11.47 <=10.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hiawatha · Hiawatha Webserverversion=11.47 <=10.8.2

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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-415Double Free
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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