CVE-2021-20403Network attack vector

Unauthorized actions via legacy-browser SameSite bypass

Published Feb 11, 2021 · Updated Sep 16, 2024

Cross-site request forgery in IBM Security Verify Information Queue 1.0.6 and 1.0.7 allows remote attackers to perform unauthorized actions. The web application relies on the SameSite cookie attribute for CSRF protection while permitting older browsers that do not consistently enforce it. Exploitation requires a trusted user to interact with an attacker-controlled request in such a browser, and the action carries that user's application authority.

CVSS severity8.8
High
EPSS probability0.39%
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 IBM Security Verify Information Queue 1.0.6 and 1.0.7 allows remote attackers to perform unauthorized actions. The web application relies on the SameSite cookie attribute for CSRF protection while permitting older browsers that do not consistently enforce it. Exploitation requires a trusted user to interact with an attacker-controlled request in such a browser, and the action carries that user's application authority.

The record

CVE
CVE-2021-20403
Published
Feb 11, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
Security Verify Information Queue
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=1.0.6
  2. Affected versionversion=1.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Security Verify Information Queueversion=1.0.6; version=1.0.7

Published CVSS scores

6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
2.7IBMCVSS:3.0/AC:H/I:L/AV:N/A:N/UI:R/C:N/S:U/PR:N/RL:O/E:U/RC:C

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link

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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