CVE-2021-21407Network attack vector

Unauthorized portal actions via CSRF token bypass

Published Jul 21, 2021 · Updated Aug 3, 2024

Cross-site request forgery in the Combodo iTop portal before 2.7.4 allows remote attackers to perform unauthorized actions through a user's browser. Combodo discloses that portal CSRF token validation can be bypassed through a tricky browser procedure but does not identify the affected handler or validation error. Exploitation requires user interaction and an authenticated portal session, and the published impact is limited to unauthorized changes made with that session's privileges.

CVSS severity8.0
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in the Combodo iTop portal before 2.7.4 allows remote attackers to perform unauthorized actions through a user's browser. Combodo discloses that portal CSRF token validation can be bypassed through a tricky browser procedure but does not identify the affected handler or validation error. Exploitation requires user interaction and an authenticated portal session, and the published impact is limited to unauthorized changes made with that session's privileges.

The record

CVE
CVE-2021-21407
Published
Jul 21, 2021
Updated
Aug 3, 2024
Vendor
Combodo
Product
iTop
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=< 2.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Combodo · iTopversion=< 2.7.4

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
8.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

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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