CVE-2023-25566Network attack vector

Unauthenticated service interruption via leaked domain allocations

Published Feb 14, 2023 · Updated Mar 10, 2025

Memory leak in GSS-NTLMSSP before 1.2.0 allows remote attackers to exhaust process memory via crafted NTLM usernames. parse_user_name duplicates a domain after the first unescaped @ but leaves domain_handled unset, so a later @ overwrites the pointer without freeing it. Repeated unauthenticated calls through gss_accept_sec_context exhaust memory and interrupt an application that accepts NTLM authentication.

CVSS severity7.5
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in GSS-NTLMSSP before 1.2.0 allows remote attackers to exhaust process memory via crafted NTLM usernames. parse_user_name duplicates a domain after the first unescaped @ but leaves domain_handled unset, so a later @ overwrites the pointer without freeing it. Repeated unauthenticated calls through gss_accept_sec_context exhaust memory and interrupt an application that accepts NTLM authentication.

The record

CVE
CVE-2023-25566
Published
Feb 14, 2023
Updated
Mar 10, 2025
Vendor
gssapi
Product
GSS-NTLMSSP
Classifications
CWE-401, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=< 1.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

gssapi · GSS-NTLMSSPversion=< 1.2.0

Published CVSS scores

7.5GitHub, Inc.CVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.002Service Exhaustion Flood

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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