CVE-2021-37760Network attack vector

Session hijacking via audit-log identifier exposure

Published Jul 31, 2021 · Updated Aug 4, 2024

Sensitive data exposure in Graylog before 4.1.2 allows attackers to hijack sessions through identifiers written to its audit log. Graylog's Enterprise Audit Log records session IDs instead of excluding authentication material, exposing active and previously active IDs to attackers able to read its entries. By default, the log resides in the local database and is restricted to administrators; a stolen ID grants only its owner's permissions.

CVSS severity9.8
Critical
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive data exposure in Graylog before 4.1.2 allows attackers to hijack sessions through identifiers written to its audit log. Graylog's Enterprise Audit Log records session IDs instead of excluding authentication material, exposing active and previously active IDs to attackers able to read its entries. By default, the log resides in the local database and is restricted to administrators; a stolen ID grants only its owner's permissions.

The record

CVE
CVE-2021-37760
Published
Jul 31, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-532, T1550
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 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

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-532Insertion of Sensitive Information into Log File
T1550Use Alternate Authentication Material

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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