Vulnerability Monitor

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CVE-2021-39880

A Denial Of Service vulnerability in the apollo_upload_server Ruby gem in GitLab CE/EE all versions starting from 11.9 before 14.0.9, all versions starting from 14.1 before 14.1.4, and all versions starting from 14.2 before 14.2.2 allows an attacker to deny access to all users via specially crafted requests to the apollo_upload_server middleware.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 1 product from gitlab organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-10-05T15:15:07.727

Last Modified

2024-11-21T06:20:27.527

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

8.0

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	gitlab	gitlab	< 14.0.9	Yes
Application	gitlab	gitlab	< 14.0.9	Yes
Application	gitlab	gitlab	< 14.1.4	Yes
Application	gitlab	gitlab	< 14.1.4	Yes
Application	gitlab	gitlab	< 14.2.2	Yes
Application	gitlab	gitlab	< 14.2.2	Yes

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39880.json Vendor Advisory ([email protected])
https://gitlab.com/gitlab-org/gitlab/-/issues/330561 Broken Link ([email protected])
https://hackerone.com/reports/1181284 Permissions Required, Third Party Advisory ([email protected])
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39880.json Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://gitlab.com/gitlab-org/gitlab/-/issues/330561 Broken Link (af854a3a-2127-422b-91ae-364da2661108)
https://hackerone.com/reports/1181284 Permissions Required, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For gitlab's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.