CVE-2021-39917

MEDIUM

6.5

CVSS Score

Published: December 13, 2021 at 03:47 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 1%

Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.9 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. A regular expression related to quick actions features was susceptible to catastrophic backtracking that could cause a DOS attack.

Affected

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

GitLab · GitLabmaven

95%

v < 14.3.6v < 14.4.4v < 14.5.212.9.0 ≤ v < 14.3.614.4.0 ≤ v < 14.4.414.5.0 ≤ v < 14.5.2

Affected range stops below 14.3.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.4.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.5.2, 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

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39917.json

References (3)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39917.json

x_refsource_MISCBroken Link

Source: [email protected]

https://gitlab.com/gitlab-org/gitlab/-/issues/338486

x_refsource_MISCPermissions RequiredThird Party Advisory

Source: [email protected]

https://hackerone.com/reports/1277918

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-697

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