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GitLab

GitLab Community and Enterprise Editions Server-side Request Forgery (SSRF) Vulnerability

CVE-2021-39935

What this means

This is rated medium severity (6.8 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Gitlab Gitlab is in your estate.

Full vendor description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API

Scoring and exploitation

6.8/ 10
CVSS 3.1 base scoreMedium

Exploitable over the network without any account, under specific conditions, and no one has to click or open anything. High impact on confidentiality, and it can reach beyond the vulnerable system.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Exploitability

Longer bar: easier to attack

Attack vectorNetworkAV:N
Attack complexityHighAC:H
Privileges requiredNonePR:N
User interactionNoneUI:N
ScopeChangedS:C

Impact

Longer bar: more harm

ConfidentialityHighC:H
IntegrityNoneI:N
AvailabilityNoneA:N
Elevated attack likelihood (~36.1% in 30 days)Model estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Not reported
Listed product
GitLab Community and Enterprise Editions

Weaknesses

CWE-918

Affected products ()

  • Gitlab Gitlab
Show the raw CPE strings (2)
  • cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*

References

7 links from the CVE record, grouped by site; the vendor's advisory comes first.

Related feed events

  • GitLab Community and Enterprise Editions Server-side Request Forgery (SSRF) Vulnerability

    Type Vulnerability

    GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorised external users to perform Server Side Requests via the CVE-2021-39935 is…

    Next step: Confirm whether GitLab is in your estate.

    Who's reporting

    1 of 3 perspectives

    Official authority: Official 1Vendor statement missing. no VendorResearcher coverage missing. no Researcher1 signal

    Only official coverage so far. Treat as an early signal.

    GitLab
    CVE-2021-39935