CVE-2023-49880Network attack vector

FIN message manipulation via mutable routing fields

Published Dec 25, 2023 · Updated Aug 2, 2024

Data manipulation in the MER facility of IBM Financial Transaction Manager for SWIFT Services 3.2.4 allows remote attackers to alter FIN messages. The facility treats each FIN message's sending address and message type as immutable while still accepting changes to both transaction elements. Unauthenticated network access is sufficient, and IBM does not disclose the specific request or validation path that reaches the flaw.

CVSS severity7.5
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data manipulation in the MER facility of IBM Financial Transaction Manager for SWIFT Services 3.2.4 allows remote attackers to alter FIN messages. The facility treats each FIN message's sending address and message type as immutable while still accepting changes to both transaction elements. Unauthenticated network access is sufficient, and IBM does not disclose the specific request or validation path that reaches the flaw.

The record

CVE
CVE-2023-49880
Published
Dec 25, 2023
Updated
Aug 2, 2024
Vendor
IBM
Product
IBM Financial Transaction Manager for SWIFT Services for Multiplatforms
Classifications
T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=3.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Financial Transaction Manager for SWIFT Services for Multiplatformsversion=3.2.4

Published CVSS scores

7.5IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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

T1565.002Transmitted Data Manipulation

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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