GitLab Community Edition/Enterprise Edition up to 14.3.5/14.4.3/14.5.1 CI Lint API server-side request forgery

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in GitLab Community Edition and Enterprise Edition up to 14.3.5/14.4.3/14.5.1 and classified as critical. This vulnerability affects unknown code of the component CI Lint API. Performing a manipulation results in server-side request forgery. This vulnerability is reported as CVE-2021-39935. The attack is possible to be carried out remotely. Moreover, an exploit is present. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in GitLab Community Edition and Enterprise Edition up to 14.3.5/14.4.3/14.5.1 (Bug Tracking Software). This affects an unknown part of the component CI Lint API. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 12/13/2021 as 34618. The advisory is shared at gitlab.com. This vulnerability is uniquely identified as CVE-2021-39935. Technical details are unknown but an exploit is available.

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 02/03/2026 with a due date of 02/24/2026:

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Upgrading to version 14.3.6, 14.4.4 or 14.5.2 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 6.8
CNA Vector (GitLab Inc.): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Server-side request forgery
CWE: CWE-918
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Community Edition/Enterprise Edition 14.3.6/14.4.4/14.5.2

Timelineinfo

08/23/2021 🔍
12/13/2021 +112 days 🔍
12/13/2021 +0 days 🔍
02/03/2026 +1513 days 🔍

Sourcesinfo

Vendor: gitlab.com

Advisory: 34618
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-39935 (🔍)
GCVE (CVE): GCVE-0-2021-39935
GCVE (VulDB): GCVE-100-188037
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 12/13/2021 19:05
Updated: 02/03/2026 21:01
Changes: 12/13/2021 19:05 (50), 12/16/2021 08:47 (3), 02/03/2026 18:00 (33), 02/03/2026 21:01 (13)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!