CVE-2021-31906Network attack vector

Incomplete audit trail for administrator file uploads

Published May 11, 2021 · Updated Aug 3, 2024

Insufficient audit logging in JetBrains TeamCity before 2020.2.2 allows remote authenticated users to upload files without a complete audit trail. Neither the CVE record nor JetBrains identifies the upload handler, missing audit event, or logging operation, and the vendor bulletin labels the product as YouTrack. Administrator privileges are required, and the bounded impact is reduced accountability for uploaded files rather than unauthorized file upload.

CVSS severity2.7
Low
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient audit logging in JetBrains TeamCity before 2020.2.2 allows remote authenticated users to upload files without a complete audit trail. Neither the CVE record nor JetBrains identifies the upload handler, missing audit event, or logging operation, and the vendor bulletin labels the product as YouTrack. Administrator privileges are required, and the bounded impact is reduced accountability for uploaded files rather than unauthorized file upload.

The record

CVE
CVE-2021-31906
Published
May 11, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:P/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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