CVE-2021-20409Network attack vector

Information disclosure via missing HSTS on errors

Published Feb 12, 2021 · Updated Sep 16, 2024

Cleartext transmission in IBM Security Verify Information Queue 1.0.6 and 1.0.7 allows remote attackers to read sensitive data. The web server omits the Strict-Transport-Security header from error responses, leaving those browser interactions open to HTTP downgrade. A man-in-the-middle position is required; the documented consequence is confidentiality loss without integrity or availability impact.

CVSS severity5.9
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in IBM Security Verify Information Queue 1.0.6 and 1.0.7 allows remote attackers to read sensitive data. The web server omits the Strict-Transport-Security header from error responses, leaving those browser interactions open to HTTP downgrade. A man-in-the-middle position is required; the documented consequence is confidentiality loss without integrity or availability impact.

The record

CVE
CVE-2021-20409
Published
Feb 12, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
Security Verify Information Queue
Classifications
CWE-319, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 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

5.9IBM CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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.

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-319Cleartext Transmission of Sensitive Information
T1557Adversary-in-the-Middle

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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