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CVE-2021-39880

MEDIUM
6.5
CVSS Score
Published: October 5, 2021 at 02:01 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorGitLab

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Severity
MEDIUM6.5
Exploit prediction
EPSS 2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab· GitLabmaven
95%
v < 14.0.9v < 14.1.4v < 14.2.211.9.0 ≤ v < 14.0.914.1.0 ≤ v < 14.1.414.2.0 ≤ v < 14.2.211.9.0 < v < 14.0.914.1.0 < v < 14.1.4
Affected range stops below 14.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.1.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.2.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39880.json
x_refsource_MISCBroken Link
Source: [email protected]
https://gitlab.com/gitlab-org/gitlab/-/issues/330561
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1181284

CVSS

6.5MEDIUMGitLab
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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