CVE-2021-41553Network attack vector

Unauthenticated session hijacking via attacker-chosen JSESSIONID

Published Oct 5, 2021 · Updated Aug 4, 2024

Session fixation in ARCHIBUS Web Central 21.3.3.815 allows remote attackers to access another user's authenticated session. The login endpoint accepts a client-supplied JSESSIONID and retains it after authentication instead of issuing a new session identifier. Exploitation requires the chosen token to become associated with an authenticated user; subsequent reuse grants that user's application privileges without credentials.

CVSS severity9.8
Critical
EPSS probability1.24%
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 ARCHIBUS Web Central 21.3.3.815 allows remote attackers to access another user's authenticated session. The login endpoint accepts a client-supplied JSESSIONID and retains it after authentication instead of issuing a new session identifier. Exploitation requires the chosen token to become associated with an authenticated user; subsequent reuse grants that user's application privileges without credentials.

The record

CVE
CVE-2021-41553
Published
Oct 5, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-384, CAPEC-61, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-384Session Fixation
CAPEC-61Session Fixation
T1550.004Web 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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