{"cve":"CVE-2021-39880","nvd":{"published":"2021-10-05T15:15:07.727","modified":"2026-06-17T04:04:21.130","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":[],"references":["https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39880.json","https://gitlab.com/gitlab-org/gitlab/-/issues/330561","https://hackerone.com/reports/1181284","https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39880.json","https://gitlab.com/gitlab-org/gitlab/-/issues/330561"],"products":["gitlab:gitlab"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-39880","score":0.02066,"percentile":0.81394,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-w6pv-c757-6rgr","url":"https://osv.dev/vulnerability/GHSA-w6pv-c757-6rgr","summary":"apollo_upload_server has Denial of Service vulnerability","modified":"2024-12-03T05:56:54.407077Z","packages":[{"ecosystem":"RubyGems","name":"apollo_upload_server","purl":"pkg:gem/apollo_upload_server","ranges":["<2.1.0"],"fixed":["2.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}