CVE-2021-20546

Local client crash via stack buffer overflow

Published Apr 26, 2021 · Updated Sep 16, 2024

Stack-based buffer overflow in IBM Storage Protect for Space Management 8.1.0.0 through 8.1.11.0 allows local users to crash the client. IBM attributes the overwrite to improper bounds checking but has not disclosed the affected command, function, or input. Local execution is required, and the documented consequence is an application crash without data disclosure or modification.

CVSS severity6.2
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in IBM Storage Protect for Space Management 8.1.0.0 through 8.1.11.0 allows local users to crash the client. IBM attributes the overwrite to improper bounds checking but has not disclosed the affected command, function, or input. Local execution is required, and the documented consequence is an application crash without data disclosure or modification.

The record

CVE
CVE-2021-20546
Published
Apr 26, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Storage Protect for Space Management
Classifications
CWE-787, T1489
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 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=8.1.0.0
  2. Affected versionversion=8.1.11.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

IBM · IBM Storage Protect for Space Managementversion=8.1.0.0; version=8.1.11.0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
6.2IBM CorporationCVSS:3.0/AV:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1489Service Stop

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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