CVE-2021-39939
Status: ModifiedMedium (6.5)—
An uncontrolled resource consumption vulnerability in GitLab Runner affecting all versions starting from 13.7 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allows an attacker triggering a job with a specially crafted docker image to exhaust resources on runner manager
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Base score: 6.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.94%
- Percentile among all scored CVEs: 60
- Score date: 10/8/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- CWE-400
References
Raw JSON (NVD)
Show
{
"id": "CVE-2021-39939",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 4,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
"authentication": "SINGLE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 8,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "cve@gitlab.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 6.5,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 2.8
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 6.5,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "cve@gitlab.com",
"affectedData": [
{
"vendor": "GitLab",
"product": "GitLab Runner",
"versions": [
{
"status": "affected",
"version": ">=13.7, <14.3.6"
},
{
"status": "affected",
"version": ">=14.4, <14.4.4"
},
{
"status": "affected",
"version": ">=14.5, <14.5.2"
}
]
}
]
}
],
"published": "2021-12-13T16:15:09.617",
"references": [
{
"url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39939.json",
"tags": [
"Third Party Advisory"
],
"source": "cve@gitlab.com"
},
{
"url": "https://gitlab.com/gitlab-org/gitlab-runner/-/issues/28630",
"tags": [
"Broken Link"
],
"source": "cve@gitlab.com"
},
{
"url": "https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39939.json",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://gitlab.com/gitlab-org/gitlab-runner/-/issues/28630",
"tags": [
"Broken Link"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-400"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "An uncontrolled resource consumption vulnerability in GitLab Runner affecting all versions starting from 13.7 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allows an attacker triggering a job with a specially crafted docker image to exhaust resources on runner manager"
},
{
"lang": "es",
"value": "Una vulnerabilidad de consumo no controlado de recursos en GitLab Runner afectando a todas las versiones a partir de 13.7 anteriores a 14.3.6, a todas las versiones a partir de 14.4 anteriores a 14.4.4, a todas las versiones a partir de 14.5 anteriores a 14.5.2, permite a un atacante que desencadena un trabajo con una imagen docker especialmente manipulada agotar los recursos del administrador de runner"
}
],
"lastModified": "2026-06-17T04:04:27.853",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F7187B3F-BBDE-4C7F-8F03-C14C02D4146C",
"versionEndExcluding": "14.3.6",
"versionStartIncluding": "13.7.0"
},
{
"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B25FBB5B-85C2-4771-B571-7945F06378A9",
"versionEndExcluding": "14.3.6",
"versionStartIncluding": "13.7.0"
},
{
"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1E801B5F-9C94-4CB2-89ED-D071E567132C",
"versionEndExcluding": "14.4.4",
"versionStartIncluding": "14.4.0"
},
{
"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7C38F838-02EA-4E2F-8493-57DD401EF911",
"versionEndExcluding": "14.4.4",
"versionStartIncluding": "14.4.0"
},
{
"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
"vulnerable": true,
"matchCriteriaId": "95F59DF7-707C-4C43-8352-8115DAF1C533",
"versionEndExcluding": "14.5.2",
"versionStartIncluding": "14.5.0"
},
{
"criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"vulnerable": true,
"matchCriteriaId": "64F26CC0-C99A-4748-963B-944F39E4B647",
"versionEndExcluding": "14.5.2",
"versionStartIncluding": "14.5.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "cve@gitlab.com"
}