CVE-2021-37189Network attack vector

Session hijacking via missing Secure cookie attribute

Published Dec 10, 2021 · Updated Aug 4, 2024

Missing cookie protection in Digi TransPort Gateway 5.2.13.4 and earlier allows attackers to expose session cookies over HTTP. The HTTPS session-cookie response omits the Secure attribute, so a user agent can attach the sensitive cookie to a later cleartext HTTP request. Exploitation requires user interaction and access to observe that HTTP traffic; the exposed cookie enables session hijacking without reported integrity or availability impact.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing cookie protection in Digi TransPort Gateway 5.2.13.4 and earlier allows attackers to expose session cookies over HTTP. The HTTPS session-cookie response omits the Secure attribute, so a user agent can attach the sensitive cookie to a later cleartext HTTP request. Exploitation requires user interaction and access to observe that HTTP traffic; the exposed cookie enables session hijacking without reported integrity or availability impact.

The record

CVE
CVE-2021-37189
Published
Dec 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-311, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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

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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-311Missing Encryption of Sensitive Data
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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