CVE-2020-4925

Local service interruption via mmfsd request flooding

Published Mar 1, 2022 · Updated Sep 16, 2024

Denial of service in IBM Spectrum Scale 5.0 and 5.1 allows local users to stop mmfsd from servicing requests through request flooding. The daemon accepts enough requests from a non-root account to exhaust its ability to process other work; IBM has not disclosed the request interface or limiting error. Local access as a non-root user is required, and exploitation stalls daemon request handling without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.23%
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 5.0 and 5.1 allows local users to stop mmfsd from servicing requests through request flooding. The daemon accepts enough requests from a non-root account to exhaust its ability to process other work; IBM has not disclosed the request interface or limiting error. Local access as a non-root user is required, and exploitation stalls daemon request handling without reported data disclosure or modification.

The record

CVE
CVE-2020-4925
Published
Mar 1, 2022
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Spectrum Scale
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 1, 2022CVE 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=5.0
  2. Affected versionversion=5.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

IBM · IBM Spectrum Scaleversion=5.0; version=5.1

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.2IBM CorporationCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P
5.9IBM CorporationCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:H/RL:O/RC:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
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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