CVE-2021-20585Network attack vector

Unauthenticated information disclosure through HTTP server headers

Published May 31, 2021 · Updated Sep 17, 2024

Information disclosure in IBM Security Verify Access 20.07 allows remote attackers to read sensitive data from HTTP server headers. IBM has not disclosed which response header or server component inserts the sensitive value, or what request causes its inclusion. No authentication or user interaction is required, and the disclosed data can support further attacks but does not directly alter data or interrupt service.

CVSS severity5.3
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in IBM Security Verify Access 20.07 allows remote attackers to read sensitive data from HTTP server headers. IBM has not disclosed which response header or server component inserts the sensitive value, or what request causes its inclusion. No authentication or user interaction is required, and the disclosed data can support further attacks but does not directly alter data or interrupt service.

The record

CVE
CVE-2021-20585
Published
May 31, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM Security Verify Access
Classifications
CWE-200
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2021CVE 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?

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  1. Affected versionversion=20.07

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Security Verify Accessversion=20.07

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.6IBMCVSS:3.0/S:U/C:L/PR:N/AV:N/AC:L/I:N/A:N/UI:N/E:U/RC:C/RL:O
5.3IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NVDAV: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 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-200Exposure of Sensitive Information to an Unauthorized Actor

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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