CVE-2021-20416Network attack vector

Cookie disclosure via missing HttpOnly flag

Published Jul 7, 2021 · Updated Sep 16, 2024

Sensitive-cookie exposure in IBM Guardium Data Encryption 3.0.0.2 and 4.0.0.4 allows remote attackers to read cookie data over the network. The web interface issues a sensitive cookie without the HttpOnly attribute, leaving its value accessible to client-side script instead of restricting it to HTTP requests. IBM does not disclose the affected cookie or triggering request, and the reported consequence is limited to reading cookie-held information.

CVSS severity3.7
Low
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-cookie exposure in IBM Guardium Data Encryption 3.0.0.2 and 4.0.0.4 allows remote attackers to read cookie data over the network. The web interface issues a sensitive cookie without the HttpOnly attribute, leaving its value accessible to client-side script instead of restricting it to HTTP requests. IBM does not disclose the affected cookie or triggering request, and the reported consequence is limited to reading cookie-held information.

The record

CVE
CVE-2021-20416
Published
Jul 7, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
Guardium Data Encryption
Classifications
CWE-732, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 7, 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=3.0.0.2
  2. Affected versionversion=4.0.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Guardium Data Encryptionversion=3.0.0.2; version=4.0.0.4

Published CVSS scores

5.3NVDCVSS:3.1/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
3.2IBMCVSS:3.0/S:U/AC:H/PR:N/AV:N/A:N/UI:N/I:N/C:L/RL:O/RC:C/E:U
3.7IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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-732Incorrect Permission Assignment for Critical Resource
T1539Steal Web Session Cookie

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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