CVE-2024-56476: IBM TXSeries for Multiplatforms 9.1 and 11.1 could allow an attacker to enumerate usernames due to an observab

Routine

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2024-56476 is a medium-severity flaw (CVSS 5.3) affecting txseries for multiplatforms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM TXSeries for Multiplatforms 9.1 and 11.1 could allow an attacker to enumerate usernames due to an observable login attempt response discrepancy.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-204
Published	2025-04-02
Last modified	2026-06-17

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-02 16:17 UTCPublished CVE record published
2026-06-17 08:12 UTCUpdated Record last modified

ibm txseries for multiplatforms DOWNGRADE

Affected: 9.1 · 11.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.1

1. Check installed version

apt-cache policy txseries-for-multiplatforms || rpm -q txseries-for-multiplatforms || txseries-for-multiplatforms --version

2. No fixed release: DOWNGRADE to a release before 9.1 (Debian / Ubuntu)

apt-cache madison txseries-for-multiplatforms sudo apt install txseries-for-multiplatforms=<VERSION_BEFORE_9.1> sudo apt-mark hold txseries-for-multiplatforms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list txseries-for-multiplatforms sudo dnf downgrade txseries-for-multiplatforms-<VERSION_BEFORE_9.1> sudo dnf versionlock add txseries-for-multiplatforms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-56476?

txseries for multiplatforms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-56476 being exploited?

CVE-2024-56476 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-56476 affect?

CVE-2024-56476 affects txseries for multiplatforms. Severity is medium (CVSS 5.3). IBM TXSeries for Multiplatforms 9.1 and 11.1 could allow an attacker to enumerate usernames due to an observable login attempt response discrepancy.

How urgent is CVE-2024-56476?

Priority 30/100. Remotely exploitable, no login, no user action

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References

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