CVE-2021-20572Network attack vector

Authenticated service crash via stack buffer overflow

Published Jun 28, 2021 · Updated Sep 16, 2024

A stack-based buffer overflow in IBM Security Identity Manager Adapters 6.0 and 7.0 allows remote authenticated users to crash the server. Improper bounds checking in the Windows Active Directory Password Synchronization Plug-in permits authenticated input to overrun a stack buffer, although IBM has not identified the affected routine or field. Exploitation requires valid remote credentials and interrupts service by crashing the host process, with no reported confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability1.50%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack-based buffer overflow in IBM Security Identity Manager Adapters 6.0 and 7.0 allows remote authenticated users to crash the server. Improper bounds checking in the Windows Active Directory Password Synchronization Plug-in permits authenticated input to overrun a stack buffer, although IBM has not identified the affected routine or field. Exploitation requires valid remote credentials and interrupts service by crashing the host process, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2021-20572
Published
Jun 28, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Security Verify Governance Identity Manager Adapters
Classifications
CWE-787, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=6.0
  2. Affected versionversion=7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Security Verify Governance Identity Manager Adaptersversion=6.0; version=7.0

Published CVSS scores

6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:S/C:N/I:N/A:P
6.5IBM CorporationCVSS:3.0/AV:N/AC:L/PR:L/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.

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

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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