CVE-2021-20355Network attack vector

Cookie disclosure via missing HttpOnly flag

Published Jun 24, 2022 · Updated Sep 17, 2024

Information disclosure in IBM Jazz Team Server 6.0.6, 6.0.6.1, 7.0, 7.0.1, and 7.0.2 allows remote attackers to read cookies. The server sets a cookie without the HttpOnly attribute, allowing locally executing browser scripts to read its value and transmit it to another site. Network access is sufficient and no authentication or user interaction is required; the reported consequence is limited to cookie confidentiality.

CVSS severity3.7
Low
EPSS probability1.11%
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 Jazz Team Server 6.0.6, 6.0.6.1, 7.0, 7.0.1, and 7.0.2 allows remote attackers to read cookies. The server sets a cookie without the HttpOnly attribute, allowing locally executing browser scripts to read its value and transmit it to another site. Network access is sufficient and no authentication or user interaction is required; the reported consequence is limited to cookie confidentiality.

The record

CVE
CVE-2021-20355
Published
Jun 24, 2022
Updated
Sep 17, 2024
Vendor
IBM
Product
Jazz Team Server
Classifications
CWE-732, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2022CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0.6
  2. Affected versionversion=6.0.6.1
  3. Affected versionversion=7.0
  4. Affected versionversion=7.0.1
  5. Affected versionversion=7.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · Jazz Team Serverversion=6.0.6; version=6.0.6.1; version=7.0; version=7.0.1; version=7.0.2

Published CVSS scores

3.7IBMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
3.2IBMCVSS:3.0/I:N/C:L/AV:N/UI:N/S:U/AC:H/A:N/PR:N/RL:O/RC:C/E:U

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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