CVE-2020-4412Network attack vector

Daemon crashes via undisclosed file system flaw

Published May 19, 2020 · Updated Sep 16, 2024

Denial of service in IBM Spectrum Scale 4.2.0.0 through 4.2.3.21 and 5.0.0.0 through 5.0.4.3 allows attackers to crash cluster daemons. IBM identifies mmfsd and mmsdrserv as the crash targets but has not disclosed the triggering input or faulty operation in the file system component. The bulletin calls the attacker local, while its published assessment indicates unauthenticated network reachability; exploitation interrupts cluster and file-system availability.

CVSS severity5.3
Medium
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in IBM Spectrum Scale 4.2.0.0 through 4.2.3.21 and 5.0.0.0 through 5.0.4.3 allows attackers to crash cluster daemons. IBM identifies mmfsd and mmsdrserv as the crash targets but has not disclosed the triggering input or faulty operation in the file system component. The bulletin calls the attacker local, while its published assessment indicates unauthenticated network reachability; exploitation interrupts cluster and file-system availability.

The record

CVE
CVE-2020-4412
Published
May 19, 2020
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Spectrum Scale
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2020CVE 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=4.2.0.0
  2. Affected versionversion=4.2.3.21
  3. Affected versionversion=5.0.0.0
  4. Affected versionversion=5.0.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Spectrum Scaleversion=4.2.0.0; version=4.2.3.21; version=5.0.0.0; version=5.0.4.3

Published CVSS scores

5.3IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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

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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