CVE-2021-20581Network attack vector

Information disclosure via unexpired session reuse

Published Oct 17, 2023 · Updated Sep 13, 2024

Insufficient session expiration in IBM Security Verify Privilege On-Premises 11.5 allows remote attackers to read sensitive information. The session-management layer fails to expire session credentials, leaving old session identifiers valid for authorization. No privileges or user interaction are required to present a retained session identifier; the reported consequence is limited to sensitive-information exposure.

CVSS severity5.3
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in IBM Security Verify Privilege On-Premises 11.5 allows remote attackers to read sensitive information. The session-management layer fails to expire session credentials, leaving old session identifiers valid for authorization. No privileges or user interaction are required to present a retained session identifier; the reported consequence is limited to sensitive-information exposure.

The record

CVE
CVE-2021-20581
Published
Oct 17, 2023
Updated
Sep 13, 2024
Vendor
IBM
Product
IBM Security Verify Privilege On-Premises
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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?

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  1. Affected versionversion=11.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Security Verify Privilege On-Premisesversion=11.5

Published CVSS scores

5.3IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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