CVE-2020-4919Network attack vector

Privileged user impersonation via incomplete logout

Published Jan 4, 2021 · Updated Sep 17, 2024

Insufficient logout controls in IBM Cloud Pak System 2.3 allow remote authenticated users with elevated privileges to impersonate other users. IBM has not disclosed which logout handler or session token remains valid, or what invalidation operation is omitted. Exploitation requires privileged access to the network-facing management interface; successful abuse grants access as a different system user.

CVSS severity3.8
Low
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient logout controls in IBM Cloud Pak System 2.3 allow remote authenticated users with elevated privileges to impersonate other users. IBM has not disclosed which logout handler or session token remains valid, or what invalidation operation is omitted. Exploitation requires privileged access to the network-facing management interface; successful abuse grants access as a different system user.

The record

CVE
CVE-2020-4919
Published
Jan 4, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
Cloud Pak System
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · Cloud Pak Systemversion=2.3

Published CVSS scores

4.7IBM PSIRTCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
5.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:N
3.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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