CVE-2020-10704Network attack vector

Unauthenticated service crash via recursive LDAP filters

Published May 6, 2020 · Updated Aug 4, 2024

Uncontrolled recursion in Red Hat Samba before 4.10.15, before 4.11.8, and before 4.12.2 allows remote attackers to crash AD DC LDAP workers. The LDAP server parses pre-authentication ASN.1 filters with a recursive-descent parser that consumes about 600 bytes of stack per nested filter. A deeply nested anonymous LDAP search exhausts the process stack and raises SIGSEGV; worker restart behavior bounds the effect to service disruption, with longer outages under older process models.

CVSS severity7.5
High
EPSS probability3.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Red Hat Samba before 4.10.15, before 4.11.8, and before 4.12.2 allows remote attackers to crash AD DC LDAP workers. The LDAP server parses pre-authentication ASN.1 filters with a recursive-descent parser that consumes about 600 bytes of stack per nested filter. A deeply nested anonymous LDAP search exhausts the process stack and raises SIGSEGV; worker restart behavior bounds the effect to service disruption, with longer outages under older process models.

The record

CVE
CVE-2020-10704
Published
May 6, 2020
Updated
Aug 4, 2024
Vendor
Red Hat
Product
Samba
Classifications
CWE-674, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions before 4.10.15
  2. Affected versionversion=All versions before 4.11.8
  3. Affected versionversion=All versions before 4.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Sambaversion=All versions before 4.10.15; version=All versions before 4.11.8; version=All versions before 4.12.2

Published CVSS scores

7.5Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-674Uncontrolled Recursion
T1499Endpoint Denial of Service

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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