CVE-2021-39066Network attack vector

Session hijacking via retained session identifiers

Published Feb 2, 2022 · Updated Sep 17, 2024

Session fixation in IBM Financial Transaction Manager for SWIFT Services 3.2.4 allows remote authenticated users to hijack sessions. The user interface retains an existing session identifier when authentication establishes the session, leaving that identifier valid afterward. Low-privilege access and knowledge of an existing identifier are required; reuse grants the authenticated session's permissions.

CVSS severity8.8
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in IBM Financial Transaction Manager for SWIFT Services 3.2.4 allows remote authenticated users to hijack sessions. The user interface retains an existing session identifier when authentication establishes the session, leaving that identifier valid afterward. Low-privilege access and knowledge of an existing identifier are required; reuse grants the authenticated session's permissions.

The record

CVE
CVE-2021-39066
Published
Feb 2, 2022
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-384, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 2, 2022CVE 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5IBMCVSS:3.0/I:L/A:L/AC:L/UI:N/PR:L/C:L/AV:N/S:U/RL:O/E:U/RC:C
6.3IBMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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

CWE-384Session Fixation
T1539Steal Web Session Cookie

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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